He has five baseballs, four rackets, and three volleyballs.他有五个棒球, 四个网球拍和三个排球.He knows the circumstance of some concerned baseballs.他知道一些有关棒球的情况.Each box contains five baseballs.每个盒子里装有5个棒球....

n.棒球运动( baseball的名词复数 )...

baseballs的音标：...