1 tell-tale

2 informer (esp. to police)

3 whistleblower

4 grass

1 secret code

2 ciphertext

3 password

4 PIN

1 secret

2 classifier: 个 gè

1 intimate

2 close

1 to keep sth confidential

2 to maintain secrecy

1 inextricably linked (idiom)

2 inseparable

1 sea of hatred is hard to fill (idiom); irreconcilable division

1 bottomless pit of desire (idiom); insatiable greed

2 carnal cravings are never satisfied and are a main obstruction on the path to enlightenment

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

1 lit. mythical bird Jingwei tries to fill the ocean with stones (idiom); futile ambition

2 task of Sisyphus

3 determination in the face of impossible odds