"in"开头的反义词是 out。例如：
1. She walked outof the room.
2. The book fell outof the backpack.
3. They decided to outsource the project.
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"in"开头的反义词是 out。例如：
1. She walked outof the room.
2. The book fell outof the backpack.
3. They decided to outsource the project.