1、There may be some residual risk involved in the project.
在这个项目中可能仍存在一些风险。

2、Even after washing, there was still a residual smell on the clothes.
即使洗过了，衣服上仍有残留的气味。

3、The residual effects of the medication lasted for several hours.
药物的残留效果持续了几个小时。