可是，影响仅当棋盘为空时能不受妨碍地流过。
Influence can only flow unhindered if the board is empty, however.
它涉及到的化学过程如果不受妨碍的话，空气中的臭氧含量就会下降。
The chemical processes in which it is involved should work without hindrance, and ozone levels will drop.
翻译：干旱陆地的野生动物的最关键的问题是能够不受妨碍地(获得)水。
The most crucial issue for wildlife in this arid land is unimpeded ________ water.
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