as needed

US /æz ˈniːdɪd/
UK /æz ˈniːdɪd/
"as needed" picture
1.

根据需要, 必要时

when or where necessary; as required.

:
Add water as needed to the mixture.
根据需要向混合物中加水。
The nurse will change the dressing as needed.
护士会根据需要更换敷料。