be suddenly serious

基本解釋

The pollution result that once petroleum development in Songhua river appears suddenly accident will be very serious.
松花江上石油開發(fā)中一旦出現(xiàn)事故其污染所造成突發(fā)事故將是十分嚴(yán)重的。
WARNING: The Floormen should always be aware of the tremendous force that can be applied and that the tongs could fly off suddenly, causing serious injury or fatality.
警告：鉆工應(yīng)該隨時(shí)注意巨大的拉力會(huì)造成大鉗突然飛出而造成嚴(yán)重的人員傷害或死亡。
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Serious thought needs to be done by those who live there, to plan for such an emergency, which could come upon them suddenly during a deluge.
居住于該地的人們需要對(duì)此進(jìn)行認(rèn)真嚴(yán)肅的考慮，為這種緊急情況未雨綢繆，因?yàn)樵诖蠛樗畷r(shí)，該狀況會(huì)突然出現(xiàn)在他們面前。