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重点讲解：
1. even though 即使；尽管；纵然；
例句：Even though I'm quite a reserved person, I like meeting people.
我虽然性格极为内敛，但喜欢和人接触。
2. at the same time 同时；
例句：It was a very strange feeling in retrospect — I was frightened, but excited at the same time.
回想起来那是一种非常奇怪的感觉——我当时既害怕又兴奋。
3. all over 到处；遍及；
例句：We have friends all over the world.
我们的朋友遍天下。
4. check out 了解清楚；核实；查实；
例句：Maybe we ought to go down to the library and check it out.
或许我们应该去趟图书馆，查个明白。
n. 宇宙，万物，世界
