Backcross
vt.vi. 使回交, (使)逆代杂交
✅ 同义词
🗣️ 情景例句
Now let's discuss the freight and packing.
现在让我们来讨论一下货运与包装问题。
David must figure on at least seventy strong men for support.
戴维至少须把七十个壮汉的协助计算进去。
What's the time?
几点了？