首先英语单词意思重叠的情况时常有
再次单词词组要记它的核心意思,
最重要的是要在例句进行区分
比如说你说的几个词组
at a time 例句Eat one apple at a time一次吃一个苹果 ,这样就知道 at a time 这“同时,一下子,每次”是指的什么了
at one time 比如说有这样一句 The kindom was ruled by a king at one time这个国度曾经被一个国王统治
at the time I was upset at the time when I heard I failed the exam.
for a time He used to live for a time in the house next to ours.他一度住在我们隔壁的那栋房子里.
for the time being We will have to wait for the time being我们占时只有等