Backcross
vt.vi. 使回交, (使)逆代杂交
✅ 同义词
🗣️ 情景例句
She suffered terribly when her son was killed.
儿子被杀，她痛苦至极。
All of us hope that you will enjoy yourselves.
我们全体人员祝大家过得愉快。
It is not a simple competition for a fixed amount of food determined by the physical environment,
它已不是为了争得物质环境所决定的有限食物而进行的简单竞争了，