由于是重复使用同一段同步代码，而不是创建自己的同步代码，因此出现的错误会少一些。

Because you are using the same synchronization code over and over, instead of creating your own, you have fewer bugs.

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同步倾仰五段式锁定机关：无论使用者前倾或后仰，椅座及椅背均能保持适当的角度；

Synchro-Dynamic Mechanism:It Maintains an Appropriate Angle Between the Backrest and the Seat with Every Body Movement;

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