The appointment of female commander of a navy warship is without precedent.

任命海军军舰女舰长是没有先例的.

The appointment of female commander of a navy warship is without precedent .

任命海军军舰女舰长是没有先例的。

But then, Peggy Whitson, the first female commander, she invited us over to the Russian segment.

但是接着呢，第一位女性指挥官，佩吉·惠特森，她邀请我们到俄罗斯区。