aim的用法说明
'aim的用法说明 1. 不管用作名词还是动词,其后均常接介词 at。如。如:He aimed hisgun at the bird, but did not fire. 他用枪瞄准鸟,但没开枪。He took aim at...'
倍数的表示法
'表示倍数时通常借助half, double, twice, three times等之类的词。如:Half (of) the apples are bad. 一半苹果是坏的。His homework is not yet half done. 他的...'