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重点讲解：
1. be known for 以…闻名的；
Ozone is best known for its role in screening the Earth from harmful ultraviolet rays from the Sun.
臭氧最广为人知的作用是保护地球免受太阳紫外线的伤害。
2. at times 有时；间或；
The debate was highly emotional at times.
辩论有时变得异常情绪化。
3. pick up 接电话；
I'll pick up the phone.
我去接电话。
4. be similar to 相像的；相仿的；类似的；
My teaching style is similar to that of most other teachers.
我的教学风格和多数教师相似。
