是in one's hand还是in one's hands

是in one's hand还是in one's hands in one's hand 还是in one's hands cards in one's hand; a 是at one's school 还是 in one's school 是in one's life还是on one's life 是hand in it 还是hand it in hand in的用法?是hand sth in还是 hand in sth hand to hand 和 hand in hand有什么区别?如果用在情人上的手牵手,是用hand to hand 还是hand in hand呢? 在某人十多岁的时候是in one's teens还是in one's tens hand in的in是副词还是介词说明 in the other hand介词是on还是in, sword in 可不可以说a sword in （one's）hand in other hand(s)翻译 John's cousin has one nice knife in his hand.(对one提问） 独自的短语是on one`s own还是in one`s own 是in one's way home 还是on one's way home 在某人的假日里是on one's holiday还是in one's holiday 在某人的假期里是In one's holiday还是on one's holiday?