这种耐研磨和不生锈套管是阀门中唯一与锚链接触的部件，因此阀门的使用寿命就更长，对维护的需求也更少。

The abrasion-resistant and rustproof sleeve is the only part exposed to the chain and the process, which results in a long service life minimal maintenance requirements.

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但是世界上许多人甚至还没有电话，接触网络和信息就更少了。

But many of the peoples of the world do not even have a telephone, much less access to the Internet and the information.

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