So, engineers sought to come up with a new product to fill a need.

因此，工程师试图设计一款新产品来满足需求。

Hill said she does think online symptom tools can effectively fill a need in the modern health system.

希尔说，她确实认为在线症状工具可以有效地满足现代卫生系统的需求。

And they have protested Facebook's claim that the app fills a need.

他们抗议 Facebook 声称该应用程序满足了需求。

Many never make it out, and sometimes that's OK— if they don't work, don't fill a need, or for any number of other reasons.

许多人从来没有成功， 有时这没关系——如果他们不工作，不要满足需求， 或者出于任何其他原因。

He said the new model can help fill a need among users who currently own one of an estimated 225 million iPhones that are at least three years old.

他说，新机型可以满足目前2。25亿用户的需求，他们中有的人手里的手机至少已经使用了三年。