A hovercraft is like a boat, but it does not float directly on the water: it floats on a cushion of air.
气垫船就像一只普通的船，但它不直接浮在水上：它浮在一层气垫上。
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A boat without its rudder will automatically float with waves.
船一失舵就不由自主地随波飘荡。
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