常見例句雙語例句Before entering an enclosed space such as ballast tank, what action will you take?在進(jìn)入封閉空間前，（如壓載水艙）應(yīng)作什么準(zhǔn)備工作？blog.sina.com.cnPumping means are immersed in the ballast 4 to ensure the extraction of water and to cause the vertical shifting of the building in the out position for interaction with the surrounding space.泵送裝置浸沒在壓載物4中以確保水被抽出，以及使處于與周圍空間相互作用的外部位置的建筑物豎直移動(dòng)。 返回 ballast space