重点讲解：
1. at first 最初；起初；开始时；
例句：At first I didn't know what to make of it.
起初我搞不清那是怎么回事,cjFU,U~PAu-nx8!xq。
2. in time 最终；迟早；
例句：He would sort out his own problems, in time.
他早晚会解决自己的问题;gdY-fLsFjq+@8xp7[7n。
3. at hand （空间或时间上）接近的，不远的；
例句：Having the right equipment at hand will be enormously helpful.
手头上有合适的设备将会帮上大忙]eUjk@D,G[7Ge%]UWlH。
4. from time to time 不时地；间或；偶尔；
例句：He does the odd job for me from time to time.
他偶尔来为我做些零碎的工作z^C1@yNC4[ZrGcoHZ..9。