infall
['ɪnˌfɔ:l]
n.
（河流的）汇流处;
（道路的）交叉处;
（水库、湖泊等的）进水口;
入侵;
例句:
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Collapsing interstellar cloud reverses its gravitational infall and expands outward into the relatively quiescent interstellar environment.
坍缩的星际云克服向内的引力而向外膨胀到较宁静的星际环境中去.
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The infall of the pirates caused the villagers to live a miserable life.
海盗的入侵导致了村民的悲惨生活.
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The death of the speleologist is due to the infall of the cave.
这位洞穴学家之死是由于地洞的塌陷.