1.  in use
2.  in service

• 1. 使用中: Occupied | in use | in service | busy
• 2. 在使用中: in use | in service | occupied | be in use be in service
• 3. 使用中球: Ball in Play

更多释义

• 1.该校自1883年以来一直在不断使用中。
  The school has been in continual use since 1883.
  dict.yoduao.com
• 2.目前，在世界范围内，80%以上适合种植农作物的土地都在使用中。
  At present, throughout the world, over 80% of the land that is suitable for raising crops is in use.
  dict.yoduao.com
• 3.美国国家资源保护委员会发现 DDT 是一系列使用中的危险化学品里最受欢迎的一种。
  The United States National Resource Defense Council has found that DDT was the most popular of a long list of dangerous chemicals in use.
  dict.yoduao.com

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