Usually there are four men and four women in a folk dancing group.
for 语句可以实现增加一定的步幅,或减少一定的步幅。
Fourier的工作使得对函数概念作一修改,即函数可以分段表示。()
Forget about where we are going to play tennis as it is starting to rain.
Forrest Gump is running across a ______-year span of American history.