已有的对网球教学的研究大多是针对教学系统中的某些因素进行的，很少有人把网球教学作为一个整体来考虑。
Most research on tennis teaching is in progress for some factor. Few people consider the tennis teaching as a whole.
这很少有人提到每个个体造成自己这种状况的因素。
There is seldom any mention of the role of the individual in determining their situation.
运气是我们不该指望的一个因素，它在某个地方，但是没有人知道在哪儿。
Luck in fact is a factor that one can not and should not count on.
没有人会怀疑气候变化中有人为因素。
Nobody doubts anymore that climate change is at least in part man-made.
没有人会怀疑气候变化中有人为因素。
Nobody doubts anymore that climate change is at least in part man-made.
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