1 tell-tale

2 informer (esp. to police)

3 whistleblower

4 grass

1 secret code

2 ciphertext

3 password

4 PIN

1 surname Feng

1 cover (of a publication)

1 secret

2 classifier: 个 gè

1 sticking unmoving to the original (idiom); not an iota changed

2 untouched

1 inextricably linked (idiom)

2 inseparable

1 to plant trees in order to stabilize sand (idiom)

1 stuck in the old ways (idiom); refusing to acknowledge new ideas

2 stagnating and conservative

1 flowering autumn grass, fine net (idiom); fig. abundant and exacting punishments prescribed by law