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1.at sea 在海上
例句：The airship circled at sea.
飞艇在海面打圈子。
2.attempt to 尝试
例句：“We shall attempt to answer it in this book, ” he wrote.
“我们将试图在这本书中回答这个问题”，他说道。
3.communications satellite 通信卫星
例句：Real-time demonstrations of the applications via communications satellite were also given.
还举办了通过通信卫星进行的实时应用演示。
4.separate with 分离
例句：You see, I don't want to separate with you.
你知道，我不想和你们分开。
