Backcross
vt.vi. 使回交, (使)逆代杂交
✅ 同义词
🗣️ 情景例句
Is something the matter, Grandpa?
怎么了，爷爷？
Drop dead
晕倒
Some people on the bank called out to the man in the boat, but he did not hear them.
岸上的一些人对着小船上的人高喊，但他没有听见。