The focusing muscle (ciliary muscle), which controls the shape of the lens, is thus in a constant state of contraction.

这种控制晶体形状的调焦肌肉(睫状肌)，长期处于收缩状态。

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Frustrating controls can lead to a constant low-level annoyance, even if an overall product concept is excellent.

即使产品整体的概念是优秀的，令人沮丧的控件也会导致经常发生的低级烦恼。

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A check valve that controls fluid flow rates to maintain a predetermined, constant pressure upstream from the valve.

为保持阀的上游的预定不变的压力所用的控制流体流量的一种止回阀。

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However, he said, the creators of bitcoins had foreseen these changes and built in controls to keep the numbers of blocks completed relatively constant.

BBC: Rewards set to halve for digital money miners

In conclusion, incoming energy throughout the year is constant, with no large variations, and humidity controls the balance of this energy between sublimation and melting.

UNESCO: Dublin Core

Substantially more complex than previous aircraft, the new plane required the pilot to attend to the four engines, a retractable landing gear, new wing flaps, electric trim tabs that needed adjustment to maintain control at different airspeeds, and constant-speed propellers whose pitch had to be regulated with hydraulic controls, among other features.

NEWYORKER: The Checklist