请问是for还是of?

请问是for还是of? 请问兽医的英文短语是a doctor for animals 还是a doctor of animals 还是an an 请问是 choose to 还是choose for 英语-请问是a dozens of还是 dozens of make a plan是of sth 还是for sth 是the meaning of 还是the meaning for? 什么什么的费用是expense of 还是expense for 是of our class,还是for our class? 一张电影票 的英文翻译是用for还是of? 是take care of yourself 还是 take care for yourself? 这里用of还是for? system跟of还是for