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重点讲解：
1. be based on 以…为基础；
The play was based on Irish legend.
这部戏取材于爱尔兰传说。
2. neither...nor... 既不…(也不…)；
Professor Hisamatsu spoke neither English nor German.
久松教授既不会讲英语，也不会讲德语。
3. ups and downs 兴衰；浮沉；起落；悲欢；
In a long life I have had many ups and downs.
在我漫长的一生中，经过许多盛衰荣辱。
4. be known for 以…闻名的；
Guilin is known for its beautiful sceneries.
桂林因风景优美而出名。
n. 屏，幕，银幕，屏风
v. 放映，选拔，掩
