過150米寬的河，與過15000寬的河是沒有區別的。但是，能夠過20米深的河就太牛了！估計有潛水艇的設計。

來源: NO-ID 於 2017-09-21 13:10:13 [舊帖] [給我悄悄話] 本文已被閱讀：次

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