留意送货车。

___Keep ___an ___eye ___out ___for the delivery van.

在医院里，工作人员留意需要额外帮助的病人。

In the hospital, staff ___keep ___an ___eye ___out ___for patients who need extra help.

徒步时，留意野生动物是明智的。

When hiking, it's wise to ___keep ___an ___eye ___out ___for wild animals.