燃气发动机是所有热机中最完美的，因为它结合了蒸汽机和内燃机的优点。
不过话得说回来，没有一桩事是容易的。
我希望在即将到来的这一年里，你会犯错误。因为如果你在犯错误，那么你就在创造新事物，尝试新事物，学习，生活，推动自己，改变自己，改变你的世界。你在做你以前从未做过的事情，更重要的是，你在做一些事情。
The will of the people, moreover, practically means the will of the most numerous or the most active part of the people; the majority, or those who succeed in making themselves accepted as the majority; the people, consequently may desire to oppress a part of their number; and precautions are as much needed against this as against any other abuse of power. The limitation, therefore, of the power of government over individuals loses none of its importance when the holders of power are regularly accountable to the community, that is, to the strongest party therein
Society can and does execute its own mandates， and if it issues wrong mandates instead of right， or any mandates at all in things with which it ought not to meddle， it practices a social tyranny more formidable than many kinds of political oppression， since， though not usually upheld by such extreme penalties， it leaves fewer means of escape， penetrating much more deeply into the details of life， and enslaving the soul itself.
The best stories don’t talk down to children—they invite them in.