这种阀门的进口和阀体为一件式铸件，确保了阀瓣，阀座和芯轴的对齐和平稳运动。

The valve inlet and body are one integral casting assuring proper alignment of disc, seat and spindle for smooth action.

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传统的运动鞋是要让人站立平稳，而这种圆弧底鞋子则是刻意要让人站立不稳。

Unlike traditional athletic shoes that are built to be stable, rocker-sole shoes are deliberately unstable.

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对于专业摄像机，缩减捕获和在变焦过程中运动平稳是非常重要的，这是为什么它可能看起来，自动对焦速度很慢。

For professional use cameras, reduced hunting and smooth movement during zoom operation is very important, which is why it may seem that the AF is slow.

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