Two hydraulic steel gates are raised, so as to seal the gondola off from the water in the canal basin.

两个液压钢制闸门抬高，以将贡多拉与运河盆地里的水隔离开。

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But few who have experienced the contagion of chaos can argue that any country in Europe can seal itself off from the sometimes violent winds of change blowing through the whole continent.

但很少有经历了这场混乱的蔓延的人可以说欧洲的任何一个国家可以把自己从席卷全洲的风暴中封锁起来。

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MicroRNAs could be used to seal off human cells from disease-causing viruses, or to disable viruses that gain entry.

小分子核糖核酸可以用来封闭人体细胞，使之免受致病病毒的侵扰，或者使病毒丧失侵入细胞的能力。

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American forces will soon seal off Baghdad from the Syrian border.

ECONOMIST: Syria hates the war, but is too weak to play the spoiler

Some advocates wants billion-dollar barriers constructed to seal off Lake Michigan from the Mississippi watershed, which opponents say would disrupt shipping traffic and cause flooding around Chicago.

WSJ: Study: Asian carp unlikely to stow away in barges

The issue is significant because it could influence the debate over whether to seal off Lake Michigan from the Chicago waterways, a mammoth engineering task that would cost billions of dollars and take years to complete.

WSJ: Report: Asian carp may have reached Great Lakes