Indeed, one has already been tested successfully by a group of marines.

其实，一群水兵已成功测试了一次。

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The method has been successfully tested for a layered model.

用本方法已对一种层状模型成功地进行了检验。

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The method has been successfully tested for a layered model.

用本方法已对一种层状模型成功地进行了检验。

youdao