this [代词] 这个 Ex: Cooking requires careful attention to detail ; this is especially important when baking . 烹饪需要仔细注意细节;这在烘焙时尤其重要。
such [代词] 这样的 Ex: He promised to support the project , and such was his commitment . 他承诺支持这个项目,如此便是他的承诺。