虽然你可能也在进行时间管理，但又常发现自己无法与时间管理系统保持一致，有时仅仅是因为没有足够的精力来做这么多事。
You might be into GTD, but sometimes every GTDer falls behind with his system, and sometimes you just don’t have the energy to do so.
这些河谷地带常发生季节性洪水，在一年的大部分时间内均保持较高的水位，是旱季重要的农田。
These river valley areas, which are seasonally flooded, or have high water tables for a large part of the year, are an important dry season farmland.
目标运动的基本假设是在一段观测时间中保持常速度，并有随机速度扰动。
A basic assumption concerning source motion is to consider it to be of constant velocity with random perturbations over the observation intervals.
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