将一段中文文本翻译成英文，其中需要包括文本的背景信息，主旨以及相关的细节描述。



文本：“萨德”（THAAD）是指在发射范围外拦截来袭导弹的末段高空区域防御系统，由美国国防部研制。在安装"萨德"的过程中引发了中韩之间的争议。美国原本计划将THAAD系统部署在韩国以应对朝鲜的导弹威胁，但是这个决定遭到了中国的抵制。
Background: The text discusses the THAAD (Terminal High Altitude Area Defense) system, which is a missile defense system developed by the US Department of Defense, designed to intercept incoming missiles outside their range.

Main idea: The text describes the controversy surrounding the installation of the THAAD system, which has caused tension between China and South Korea, and has been proposed as a response to the missile threat posed by North Korea.

Details: The THAAD system was originally planned to be deployed in South Korea, but China has strongly opposed this decision. The system has caused controversy due to concerns that it could be used to spy on China, and that it could potentially be used as a part of a broader US strategy to contain China's military power. Meanwhile, South Korea has argued that the system is necessary to protect against the growing threat from North Korea.