grave guard
严重的警卫
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"It is considered a grave breach of security rules," a police spokesman said, adding that a prison guard or a police officer should have been on the tower at all times.
“我们认为这严重违反了安全条例，”警方发言人说，并指出任何时候了望塔上都应该有一名监狱警卫或是警官。
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