Knowing that danger threatened, the sentry was on the alert.

因为知道危险势将发生，这哨兵加意戒备。

※If you wish to succeed , you should use persistence as your good friend , experience as your reference , prudence as your brother and hope as your sentry. (Thomas Edison , American inventor )——如果你希望成功，当以恒心为良友、以经验为参谋、以谨慎为兄弟、以希望为哨兵。 (美国发明家 爱迪生. T.)

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