be careful;take care;look sharp;keep one's eyes peeled [skinned];look out ;

Still, I had also judged the jungle of both banks quite impenetrable.
其次, 我先前早已留神了,两岸的丛林异常茂密,一眼看不透.
来源:词典精选例句The guide told us to look sharp because there are rattlesnakes around.
向导要我们特别留神,因为附近有响尾蛇.
来源:《现代汉英综合大词典》Keep your eye on these jokers, you never know what they will come up with.
留神那些活宝,你永远也不知道他们会想出什么样的主意。
来源:《柯林斯高阶英汉双解学习词典》The slightest little bit of inattention can let something slip through.
稍不留神就会让某些东西蒙混过关。
来源:《柯林斯高阶英汉双解学习词典》They're both asleep upstairs, but you don't mind listening just in case of trouble, do you?
他们都在楼上睡着了,但你不介意留神听着点以防万一吧?
来源:《柯林斯高阶英汉双解学习词典》
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