1 author

2 writer

3 classifier: 个 gè

1 tell-tale

2 informer (esp. to police)

3 whistleblower

4 grass

1 (slang) very close same-sex friend

2 gay partner

1 base (of operations)

2 industrial or military base

3 al-Qaeda

1 basic

2 fundamental

3 main

4 elementary

1 lit. 之[zhī], 乎[hū], 者[zhě] and 也[yě] (four grammatical particles of Classical Chinese) (idiom); fig. archaic expressions

1 The benevolent sees benevolence, the wise sees wisdom.

2 Different views are admissible. (idiom)

1 He who comes is surely ill-intentioned, no-one well-meaning will come (idiom).

2 Be careful not to trust foreigners.

3 Beware of Greeks bearing gifts!

1 to refuse nobody (idiom)

2 all comers welcome

1 unique

2 unprecedented (idiom)