内燃机油在中低温运行工况下容易产生油泥问题，一直是油品研制者关注并设法解决的对象。

The sludge forms easily while the engine oil runs at medium and low temperature, which has been a problem that the oil developers pay attention to and want to solve all along.

“艾伦侦察器”的研制者们说，设计这款相机的目的是为了在那些耗时耗力也很难到达的危险地带进行拍摄。

The makers of the Aeryon Scout say it was designed for taking pictures of places where it"s too difficult, dangerous or time-consuming to go."

既然仿人机器人制造代表了高超的技术水平，为什么在美国研制者寥寥无几，而且开发的团队规模狭小，多数是一群没有报酬的学生？

Nearly everyone would want a dutiful, reliable robot helper, so why is there only one such humanoid made in this country? And why is it the work of a small team of unpaid students?