by
prep. 由,被;通过,凭借……;相差;在……旁边;到……之前;抓着(身体或东西某个部位);按照,依据;以……计;在……期间;在(某处)短暂停留;乘以,除以;以……名义(发誓);就(本性、职业或出身)而言
adv. 经过
例句
They sleep by day and hunt by night.
他们白天睡觉,夜晚捕猎。
《牛津词典》
He was a loner by nature and by inclination.
他天性不喜交际,且自己也无意于此。
Nocturnal animals sleep by day and hunt by night.
夜间活动的动物白天睡觉晚上猎食。