They could not leave the city unguarded.
能让这座城市设防。
；无人守
心，
留神;心;;
,即席,尚未准好;;, 脆弱, 敏感;;;;;到, 可及;They could not leave the city unguarded.
能让这座城市设防。
She let the news slip by mistake, in an unguarded moment.
她一留神泄漏了消息。
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