重点讲解：
1. first of all
首先；最初；
eg. First of all, you should know what profession suits you.
首先，你该知道什么职业适合你TQmD]1UXoe。
eg. First of all she just smiled, then she started to laugh.
最初她只是微笑，后来才放声大笑tu^MP[I0LX,W~22。
2. from time to time
不时地；间或；偶尔；
eg. Her daughters visited him from time to time when he was ill.
他生病的时候她的女儿们时常去探望他+6WL)^uA4Ht7Pg。
eg. From time to time,she gave him an encouraging nod.
她不时对他点头鼓励!4IxhHd~oPpm。
3. for sure
无疑；肯定；
eg. Even to this day we don't know what happened for sure.
即使到现在我们也不确定究竟发生了什么xvQ),oN|I~YXb=keCfg。
eg. Well, we can't cut the research budget, that's for sure.
嗯，我们不能削减研究的预算，这是肯定的0E]FmvYuI&mz。