1. The animals were then trained to operate a lever with a foot to release food. 
   然后经过训练，这种动物就可以用一只脚操作杠杆移动食物。
2. engages a rocking lever. 
   避免摇动杠杆离开的装置。
3. hand chain block and lever 
   手动葫芦
4. Money is a good lever. 
   钱对人大有帮助。
5. Pressed hard on the lever. 
   猛烈地压在控制杠上

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• 2. 释放手柄
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