介词at by为什么用at the sea而 by the lake

列出了一点at和by的区别用法,这个为什么at the sea/by the lake我觉得英语中这种东西还是要背的,希望我提供的答案对你学习有帮助.
at
1.(position,time,age) 在 2.to throw sth at sb (towards) 向某人扔某物 3.(referring to price,speed etc) 以 4.(in measurements) 达 5.at 110 kilos,she's very overweight 达到110公斤,她严重超重了 6.(referring to activity) 在…方面 7.(referring to cause) 由于 8.not at all (in expressions) (in answer to question) 一点也不 9.(in answer to thanks) 别客气
by
1.(referring to cause,agent) 被 2.by bus/car/train (referring to method,manner,means) 乘公共汽车/汽车/火车 3.(via,through) 经由 4.(close to,beside) 靠近 5.(past) 经过 6.(with times,dates,years) 以前 7.by day/night (during) 在白天/晚上 8.(specifying number,quantity,rate) 按 9.(specifying degree of change) 相差 10.a room 3 metres by 4 (in measurements) 一间长3米宽4米的房间 11.to divide/multiply by 3 被3除/乘 12.by law ...

by sea 乘船。。