| natural instinct | 自然本能 |
| never ever | 绝不，从不 |
| no doubt | adv. 无疑地；很可能地 |
| no more | 不再 |
| no more than | adv. 只是；仅仅 |
| no way | 决不；一点也不；不可能 |
| not in the least | 一点也不；丝毫不 |
| not more than | 不超过;不到;至多 |
| not nearly | 远非；绝不是 |
| now and then | 不时地；常常 |
| of course | 一定，当然 |
| off duty | 下班；不值班 |
| old school | 守旧派，保守派 |
| on account of | 由于；因为 |
| on board | 在船（火车、飞机）上 |
| on condition that | 条件是;在…条件下 |
| on duty | 值班，上班 |
| on edge | adv. 紧张；急切；竖着 |
| on fire | adv. 着火；起火；在兴头上；非常激动 |
| on one hand | 一方面 |