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最近遇到了两个问题，请老师帮忙解决，谢谢！Working in the restaurant was a source of great pride because I was pitching in for the good of the whole family.在这句话中，a source of是什么意思？？？ be pitching in for又是什么意思，相当于be able to吗？另外be pitching in for该怎么用呢？谢谢！万分感谢！ ...
问大家几个问题，请详细解答，谢谢！1、已知平面上直线L的方向向量e=(-4/5,3/5)，点O(0,0)和A（1，2）在L上的射影分别是O’和A’则O’A’=xe，其中x为多少？
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军训.............