successful defense

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1.

Short had disposed his airplanes and antiaircraft guns in such a manner as to make successful defense impossible .

肖特则将他的飞机和高射炮配备成不可能进行有效防御的状态。

2.

In earlier incidents , some commercial crew members took to pelting marauders with tomatoes , but that has not proven a successful defense .

在早些时候发生的事件中，有些商船船员向海盗连续投掷西红柿，但这种做法未能达到自卫目的。

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