benefit from: 受益
The economy now would benefit from some real engineering.
现在一些真正的工程才会令该国经济受益。
Humans are not the only species to benefit from foxp2.
人类并不是唯一受益于foxp2基因的物种。

flex time: 弹性工作时间
If you want flex time, you'll have to talk it over with your supervisor.
如果你想要弹性工作时间，你可以和你的上司谈。
The time that's left over can be your flex time.
剩余的时间你就可以灵活掌握。

come up with: 提出
To come up with more creative and innovative designs?
还是想出更原创性和革新性的设计？
Others strive to come up with something a little different.
其他人力图想出些有点不同的名字。

pile on: 积累
Another way to reduce both the fat and sodium content of your sandwich is to use less meat and pile on extra veggies instead.
降低你的三明治的脂肪和盐含量的另一种方法是少食用肉，多堆些蔬菜。
It makes them feel more secure. I say pile on the hugs.
说是能让他们感到安全，所以我们就去多抱抱孩子。