Backcrossing
v. 回[逆]交, 回交雜種( backcross的現在分詞 )
? 同義詞
??? 情景例句
How do you say that in English?
那個用英語怎么說？
Everybody recognizes her ability.
人人都認定她的才能。
However, rescue operations are proving difficult.
然而，事實證明營救工作非常困難。