To begin to understand why, remember that water in a reservoir naturally flows preferentially to any crack in the dam. 要探究原因，可以聯想一下蓄水池的水，當水壩有裂縫時，水很自然的會先由裂縫流出。
These animals act as the reservoir for the rabies virus and for its continued spread. 這些動物擔當狂犬病毒的蓄水池並使他們繼續傳播。
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