1 letter

2 mail

3 classifier: 封 fēng

4 to trust

5 to believe

6 to profess faith in

7 truthful

8 confidence

9 trust

10 at will

11 at random

1 information

2 news

3 message

1 to gain

2 to get

3 to acquire

1 to be convinced (that sth is true)

2 to believe

3 to accept sth as true

1 text message

2 SMS

1 to judge sb by appearances (idiom)

1 to speak without thinking (idiom)

2 to blurt sth out

1 to be trusted both at home and abroad (idiom)

1 brimming with confidence (idiom)

1 lit. use others' strengths to make up for one's weak points (idiom from Mencius)

2 to use this in place of that

3 what you lose on the swings, you win on the roundabouts