重点讲解：
1. even if 即使；尽管；纵然；
例句：Her idea is fundamentally sound, even if she says silly thing sometimes.
即使她有时说些傻话，她的想法基本上是好的eGj2]-a7!dSo0XIu|Us。
2. for sure 无疑；肯定；
例句：No one knows for sure how people first learned to preserve food.
没有人确切地知道当初人们是如何学会保存食物的X)@Cs~ypQ0zv)%。
3. be filled with 布满；使遍及；
例句：The hall was filled with choking clouds of smoke.
大厅里充满了使人窒息的烟雾+dGjcC=2r8wg~r,)tkHe。