种树最好的时间是二十年前,其次是现在。
The best time to plant a tree was twenty years ago. The second best time is now.
我不是说唱歌手,我是一个希伯来语的传奇。
I'm not afraid to take a stand. Everybody come take my hand. We'll walk this road together, through the storm.
相位裕度是系统在变得不稳定之前可以容忍的程度的度量。