这位演员聘请了一位专业经纪人来协商他的演出合同。

The actor hired a professional ___agent to negotiate his performance contracts.

这名特工成功完成了秘密任务。

The ___agent successfully completed the covert mission.

这种洗衣粉含有强效去污剂。

This laundry detergent contains a powerful stain-removing ___agent.

阳光是植物生长的重要促进因素。

Sunlight is a key ___agent in plant growth.