S____ (被困于)in the traffic jam, he failed to arrive on time.
This September Mike is going to a new ____(中学)
在人类中,Klinefelfer综合症表现为中间性别,其性染色体为XXY。若患者的性染色体异常为父方引起,则是因为精原细胞形成精子的过程中( )