aim
1.aim(不及物动词)在用作“目的在于…”或“使…目的在于…”解的时候,在英国后面通常接at和动名词,在美国通常接不定式。如在英国通常说He aims at mastering English和He aims his efforts at mastering English,在美国通常说He aims to master English和He aims his efforts to master English。但在aiming后面即使在英国也通常接不定式,那是因为不知不觉地避免...ing at...ing。
2.take aim(瞄准)里没有an, take good aim里没有a。
3.Her aim in visiting the school was to see the library等句子里的in不可改作of。She visited the school with the aim of seeing the library等句子里的with不可改作for。