... lookout on the forecastle 了头 to maintain a lookout 保持警戒 looknot 环结 ...
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to maintain a lookout
保持警戒
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But the master of the Bowbelle dredger Captain Douglas Henderson was tried twice for failing to maintain a proper lookout.
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