propulsion

2 篇文章
...jet propulsion.
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...jet propulsion. 喷射推进

propulsion jet
no need for the jet propulsion used by it's shallow water relatives above.
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no need for the jet propulsion used by it's shallow water relatives above. 不象它的浅海亲戚利用喷射水流的反作用力

relatives propulsion shallow used jet above need for water no it's the by
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