算单数。
Dometimes he or she doesn't know that.但是有时候他或她并不知道这一点。
He or she also expresses the assembly's opinions externally 他或她也对外表明议会的意见。
He or she knows the moving in or out ?他或她知道收缩或膨胀的活动?
Should he or she elect to wear a belly button ring or a barbell?
她或者他，选择佩戴肚脐环还是肚脐铃
