This is particularly true for trees in the middle and upper latitudes, which tend to attain greater heights on ridges, whereas in the tropics the trees reach their greater heights in the valleys.
这种情况在中高纬度地区的树木中尤其常见，这些树木往往在山脊上长得更高；而热带地区的树木则往往在山谷中会长得更高。
They have been encouraged to climb onto the occupational ladder only to discover that the middle rungs are dominated by men and the upper rungs are out of reach.
她们被鼓励着登上了职业的阶梯，却只发现中间那几级已经被男人们占据了，而顶上几层压根就够不到。
The middle lower reach is also subdivided vertically into weak phreatic aquifer in the upper part and strang confined aquifer in the lower.
对上游潜水和中下游承压水用二维侧向流数学模型，对中下游弱潜水用一维垂向流数学模型。
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