Our entire human society will be faced with a long-term problems that how to put combustion the most common energy conversion mode more efficient, less impacted to the environmental.

如何把燃烧这种最为普遍的能量转换方式变得更为高效、对环境影响更小，将是我们整个人类社会面临的一个比较长期问题。

youdao

This circuit is shown in Figure 5 and is useful as a computational amplifier, in making a differential to single-ended conversion or in rejecting a common mode signal.

电路见图5，这种电路在运算电路中相当有用，比如差分对单端的转换，抑制共模信号。

youdao