| 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 |