In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.

在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。

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The overhang at the lower edge of a roof.

位于屋顶的最低的边缘的上方的突出部分。

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The steering wheel rim has a flat lower edge.

方向盘的边缘有一个平坦的下边缘。

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We both ran a careful finger along the lower edge of each eye, to wipe the tears without smearing the makeup.

NPR: Waiting and Dreading: Families in War Time

Did any left-landed people test this phone (who would presumably have hold the phone with their palm covering the lower left edge of the phone)?

FORBES: Please Remember To Hold Your New iPhone Correctly

Oil giant BP saw profits edge lower in the first three months of the year.

BBC: BP's profits edge lower but beat forecasts