1) It's freezing(bitterly)cold today.
今天冷得刺骨。
2) It was bitterly cold.
那天冷得刺骨
4) It is bitterly cold today.
今天冷得很。
5) There's a nip in the air today.
今天寒风刺骨。
6) it was bitterly cold; bitter cold.
冷得刺骨;刺骨地冷。
参考词条