Four multiplied by seven is twenty-eight.
7乘4等于28。I have seven roommates in my university.
上大学时,我有七个室友。

权威例句

Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground EmissionThe magic number Seven : somes limits in our capacity for processing informationSeven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Power Spectra and WMAP-Derived ParametersSelf-rated health and mortality: a review of twenty-seven community studiesSEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP *) OBSERVATIONS: ARE THERE COSMIC MICROWAVE BACKGROUND ANOMALIES?HIV-1 Entry Cofactor: Functional cDNA Cloing of a Seven-Transmembrane, G protein-Coupled ReceptorDaytime sleepiness and vascular morbidity at seven-year follow-up in obstructive sleep apnea patients.