1 tell-tale

2 informer (esp. to police)

3 whistleblower

4 grass

1 to rush about

2 to be constantly on the move

1 secret code

2 ciphertext

3 password

4 PIN

1 Poland

2 Polish

3 abbr. for 波蘭|波兰[Bō lán]

1 jackfruit

2 breadfruit

3 Artocarpus heterophyllus

1 before the first wave subsides, a new wave rises (idiom); a new problem arises before the old is solved

2 many twists and turns to a story

3 one thing after another

1 inextricably linked (idiom)

2 inseparable

1 to push the wave and add to the billows (idiom); to add momentum

2 to encourage sth to get bigger

3 to add fuel to the fire

1 to cast flirtatious glances at sb (idiom)

1 crystalline waves (idiom)