## 1 Introduction  
Layered two-dimensional (2D) materials have attracted considerable attention due to their excellent properties: unique electronic structure, tunable bandgaps, atomic-level thickness, and van der Waals (vdW) integration capability. Compared to the direct synthesis method, the mechanical transfer method for manufacturing vdW heterostructures allows for free stacking of 2D layers at any angle without restrictions from covalent bonds and lattice matching [1; 2; 3]. Through the mechanical transfer method, different 2D materials can be combined into heterogeneous structures without any limitations in epitaxy, which greatly facilitates the assembly of high-quality vdW heterostructures and expands the exploration of their optical properties [4; 5; 6]. vdW heterostructures have promoted the development of condensed physics, such as confirming Hofstadter butterfly topologies [7; 8; 9], finding thermodynamic evidence for fractional Chern insulators [10] and gate-tunable Mott insulators [11; 12], and achieving unconventional superconductivity in magic-angle superlattices [13; 14]. Transition metal dichalcogenides (TMDCs) exhibit strong spin-orbit coupling (SOC) and high exciton binding energy, making them excellent candidates for building a vdW heterostructure platform to study novel physics. As representative TMDCs, monolayer tungsten disulfide (ML-WS\({}_{2}\)) and molybdenum disulfide (ML-MoS\({}_{2}\)) have emerged as promising candidates for constructing heterostructures due to their unconventional properties, including the conversion of indirect/direct bandgaps [15; 16; 17; 18; 19], valleytronics [20; 21; 22; 23],and the large binding energies of excitons [18; 24], positioning them as ideal platforms for exploring the quantum effect in condensed matter systems. The interlayer interaction is one of the most important properties of MoS\({}_{2}\)/WS\({}_{2}\) heterostructures [25; 26; 27]. [PERSON] et al. experimentally observed that the photoexcited holes transferring from MoS\({}_{2}\) to WS\({}_{2}\) take place within an ultra-short time: 50 fs [25]. [PERSON] et al. reported on the interlayer hole-transferring process and the formation of spatially interlayer excitons with longer lifetimes in MoS\({}_{2}\)/WS\({}_{2}\) heterostructures [26]. [PERSON] et al. determined that Raman scattering and their underlying interlayer interactions depend on the twist angle in twisted MoS\({}_{2}\)/WS\({}_{2}\) heterostructures [27]. Understanding the interlayer interactions in vdW heterostructures under different conditions is crucial for optimizing their performance. The precise tuning of bandgaps, photoluminescence energy, and quantum yield at the nanoscale greatly expands the application prospects of two-dimensional materials in micro-optoelectronic devices. Various methods have been reported for tuning the electronic structure of 2D materials, including electric field modulation [28; 29], chemical modification [30; 31], magnetic field modulation [32], and mechanical strain [15; 33; 34]. It is noteworthy that the strong planar mechanical strength and small bending stiffness of 2D materials, coupled with their reversibility compared to other tuning methods, make them particularly suitable for strain engineering [35; 36]. For example, [PERSON] analyzed the strain tunability of the exciton properties of monolayer and few-layer MoS\({}_{2}\), MoSe\({}_{2}\), WS\({}_{2}\), and WSe\({}_{2}\) by bending the substrate [37]. [PERSON] et al. employed exciton imaging to investigate the band structure of a monolayer MoS\({}_{2}\) under macroscopic strain and observed a strain-induced bandgap reduction and exciton funneling phenomenon [38]. Although strain engineering has been extendedly explored in TMDC monolayers, multilayers, and heterostructures, most studies primarily focus on macroscopic strain, while single-point pressure is rarely studied. Due to the anisotropy of monolayer TMDCs, the regulation of excitons by macroscopic in-plane strain and out-of-plane localized strain is completely different.