1. He held hard on to the rope.
   他牢牢抓着绳子。
2. He sat down hard on his tail.
   他一屁股坐了下来。
3. I work hard on workday.
   我在工作日努力工作。
4. She hit/struck him hard on the face.
   她用力地打他耳光.
5. He works hard on workday.
   他在工作日努力工作。

　1个名词解释