Daniel dont want to selfish to let on dme a few years, he has offered to give up and Li Jun relationship.

丹尼尔不愿意自私地让李君等他几年，主动表示想放弃与李君的恋情。

Jack gets into a waiting helicopter, asking Nina not to let on that he requisitioned it for personal use.

然后，他搭上了一架等候中的直升机，他申请这架直升机是办私事的（他需要快点去医院），所以他请求尼娜不要告诉他人。

EXAMPLE: Everyone in the office was careful not to let on about the party planned for their manager's birthday.

办公室里的每个人都在小心翼翼地保守为经理举行生日聚会的秘密。