10-12 · 回复 @lizhenxuan：So is there a trash bin in your mind?

10-12 · 回复 @lizhenxuan：At least "should" is grammertically correct.

10-12 · scathe 
Definition:  (noun) The act of damaging something or someone.  
Synonyms:  damage, harm, hurt  
Usage:  It is true als...

10-12 · You're not obligated to win. You're obligated to keep trying.

10-12 · 回复 @啊啊是谁都对：Okay

10-12 · But when you delete a file in computer it can't be restored, right? So do I

10-12 · 回复 @啊啊是谁都对：Er…that's really a big problem.

10-12 · Welp, I wonder if you could re-remember something that you've forgot you've chosen?

10-12 · And if I 【should】 master it
That's quite formal. Maybe "could" can suit the sentence better. Of course you can also just cross out it, then "master" can keep unchanged or be changed into "mastered".

10-12 · That would be quite happy! At least a man with the skill of cooking can have a meal time that depends on himself.