as needed
US /æz ˈniːdɪd/
UK /æz ˈniːdɪd/

短语
1.
根据需要, 必要时
when or where necessary; as required.
示例:
•
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。
在 Lingoland 学习这个单词
根据需要, 必要时
when or where necessary; as required.