1 grave

2 serious

3 severe

4 critical

1 surname Cong

1 always

2 at all times

3 never (if used in negative sentence)

1 from now on

2 since then

3 henceforth

1 difficult (to...)

2 problem

3 difficulty

4 difficult

5 not good

1 lit. An interval of time is worth an ounce of gold, money cannot buy you time. (idiom)

2 fig. Time is precious and must be treasured.

1 lit. a single post cannot prop up a falling house (idiom)

2 fig. one is helpless alone

1 lit. once said, a team of horses cannot unsay it (idiom); a promise must be kept

1 hard to explain in a few words (idiom); complicated and not easy to express succinctly

1 there is nothing the determined person can't accomplish (idiom)

2 persistence will overcome