Steven is at the swimming pool.这句子...

Steven is in the swimming pool
英语中:at主要表示：
(1)在某具体时刻之前,如atseveno’clock,at7：30.
(2)在固定短语中,如：atnoon,atnight,atthattime,attheageofattheweekend,atChristmas.
表示地点的at的用法区别
(1)at通常指小地方,in一般指大地方.
(2)at所指范围不太明确,in指“在……里”.
at
1.动词+ at.at表示“指向某一目标,到达某地”：arrive at抵达,
call at访问某地,catch at(it)当场抓住,come at攻击,fire at向…开火,
glance at瞟一眼,glare at怒目而视,grieve at忧伤,knock at敲,
laugh at嘲笑,look at看一眼,pull at拉扯,rejoice at对…高兴,
smile at向某人微笑,shoot at朝…射击,stare at怒目而视,
thrust at刺向,tear at撕,tremble at颤抖,wonder at吃惊,work at工作.
例如：
don’t let me catch you again at it.不要再让我当场逮住你.