in BRIT, also use 英国英语亦用 unlearnt
										- VERB 设法忘记(或忽略);抛掉(以前的错误想法、坏习惯等)
 If you unlearn something that you have learned, you try to forget it or ignore it, often because it is wrong or it is having a bad influence on you.- They learn new roles and unlearn old ones...
 他们学习新的角色,抛却旧的角色。
- Before you know it, you will have unlearned the debt habit.
 很快你就会摒弃欠债的习惯。