as needed

基本解释

Grid provides an infrastructure that you turn it on and off as needed.
可以根據需要打開和關閉網格提供的基礎設施。
You should expand on them to provide more error trapping and functionality as needed.
您應該根據需要擴展它們，以提供更多的防錯措施和功能。
If the data set is large, do you have to send it all at once, or can you send pieces of it as needed?
如果數據集非常大，那麽是必須同時發送完整的數據集，還是可以根據需要發送它的片段？

Also,the root can stay in the ground for as long as three years, so it can be harvested as needed.
By the way, after class, I'm more than happy to stay as long as needed to answer any questions you guys have or to talk about whatever issues you'd like to bring up, but probably what makes sense is for me to power down the computer and pack up and then we can stand out in the hallway and I can answer questions out there, that way the next class can get in and the instructor can work unimpeded.
順便說一下,課後,我很樂意多待一會,來廻答你們的問題,或者討論一些你們提出的問題,但我最好是,把電腦關掉,收拾好東西,然後在走廊裡來廻答你們的問題,這樣下節課才能照常進行,老師也能正常授課
耶魯公開課 - 關於食物的心理學、生物學和政治學課程節選
and I knew if I wanted to be good, as good as I wanted to be, I needed to come here.
而且我知道，如果我想變得更好，變得和我想的一樣好，我就得到這裡來。
和紐約的畱學生 - SpeakingMax英語口語達人

Banks normally loan money between themselves as needed by providing mortgages and other capital as collateral.
FORBES: The Election Should Be Settled by a Single Question: Who Caused the Financial Crisis?