Water is the life blood of this area, but it takes constant vigilance and effort to keep it in its place.

水是当地的命脉，但也需要不断提高警惕和不懈的努力来使之不至泛滥成灾。

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Personal projects, constant sketching, running design programs are all ways strategic designers use to keep in touch with things.

个人项目，不断练习草图，进行设计方案，这些都是战略设计师为自己充电的方法。

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The earth seemed too earthy for him, with too little water to keep it sufficiently clean; so that he had to be in a constant state of warfare with its chronic soiled state.

在他眼里，大地似乎显得太过于泥土气了，水也显得太少，以致不能使土地够得上干净；因此他得不断地与这惯常的尘土状态作战。

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On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.

另一方面，温度，体积和压强,在实验室中比较容易保持恒定。

麻省理工公开课 - 热力学与动力学课程节选

All right? It's now something that I can search in constant time. And that's what's going to allow me to keep this thing as being log.

在固定的时间内搜索,这样就可以让时间复杂度保持在对数级,好的，考虑过了这些。

麻省理工公开课 - 计算机科学及编程导论课程节选

Of course, leaving a smartphone's display on for multiple hours as you traverse Montana, Wyoming, Idaho, Oregon and California isn't wise without a power source to sustain that type of abuse, so it's worth mentioning that I traveled with an AC inverter in order to keep a constant power connection to the Lumia 900.

ENGADGET: Nokia Drive offline navigation review: taking the Lumia 900 for an off-the-grid spin

Keep in mind that balance in life requires constant adjustment.

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He is following a simple rule: Keep the angle of the falling ball constant in your vision and adjust your running speed accordingly.

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