Do you mean how do I know that it is perpendicular to a level curve?
你想问的是，我如何知道它是和等高线垂直的吗？
These are all nice words, but what does that mean on a practical level?
话虽这么说了，但是具体操作起来该怎么做呢？
These verbs mean to move something from a lower to a higher level or position.
这些动词的意思是使某物从较低移到较高水平或位置。
You mean getting into university actually depends on your passing your a level subjects?
你是说上大学实际上是由你通过A水平科目决定的？
Which coincide with the mean sea level surface is the geoid.
其中与平均海平面重合的面就是大地水准面。
Mean sea level is an equipotential surface with respect to gravity.
平均海平面就是一个关于重力的等位面。
The mean difference of the post-test was significant at the 0.05 level.
实验组和对比组时间的平均数差异经过t检验，在0.05的水平上具有显著性。
Results: the mean DNA level did not change significantly during chemotherapy.
结果：通过化疗，DNA的平均水平没有发生显著变化。
What does achieving this goal mean to you at the most basic level?
实现这个目标在最基本的层面上，对你来说有什么含义？
Height: the altitude of your observing site above the mean sea-level, in meters.
海拔：你的观测地点的海拔高度，单位是米。
Height: the altitude of your observing site above the mean sea-level, in meters.
海拔：你的观测地点的海拔高度，单位是米。
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