The Indians cut notches on a stick to keep count of numbers.印第安人在棒上刻V形 凹痕用来计数.On the third day, General Zhang raised the temperature of the assembly a few notches.第三天，张将军使大会的热烈程度提高了几档。Acting and direction are several not...
这里你应该用复数代词.Here you should use plural pronoun.这里有关于用复数来讲二维力学的简短讨论.There is a brief discussion of two dimensional mechanics in terms of complex numbers.用复数算术推导了正弦,余弦的加法公式.We derive the addition formulas for sine and cosin...