Hansen mark this message contains true information
｜originally written by Hansen
可能被沖開表示有機率，並不表示一不一定會。會不會打開井蓋幫助排水不得而知，但如果水溝排不了打開井蓋也沒用。不管你在哪裡看到漩渦一定要改道，包括海上的船。
References
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