另外，耳机接口只能单向发送信息：从电源到扬声器。
Plus, the headphone jack only sends information one way: from power source to speaker.
单向环形激光器被证实是获得稳定单频运转最有效的方法。
This has proved to be an extremely effective way to achieve robust single frequency operation.
该灯器可发出单向强烈光束。
The range light is capable of sending out a strong beam of light.
平衡系统设计：采用了弹簧平衡系统、电磁式制动器和单向延时气缸；
Balance system design: Adopted Springs and a Brake and a Lay air cylinder;
平衡系统设计：采用了弹簧平衡系统、电磁式制动器和单向延时气缸；
Balance system design: Adopted Springs and a Brake and a Lay air cylinder;
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