如果发球不过网或球的第一落点不在应该击中的接发球区，就算是发球失误。
If the ball does not cross the net , or it does not first hit the ground in the correct service court , it is a faulty service .
左、右区接第一发球落点在对方的后场位置最高为49%和54%。
Left and right after the first service area in the backcourt position placement of 49 % and 54 percent .
第一落点