| Subject | English | Chinese |
| sport. | A javelin throw shall be valid only if the tip of the metal head strikes the ground before any other part of the javelin | 只有标枪金属头的尖端比其他部位先插人地面、 投掷方为有效 |
| el. | if and only if | 当且仅当 |
| busin. | "if and only if" | "即使只要" |
| oil | if and only if | 数学用语当且仅当 |
| gen. | if and only if | 如果仅仅如果语句 |
| busin. | "if and only if" statement | "即使只要"陈述 |
| gen. | if I only knew | 要是我知道的话多好 |
| scient. | if only | 只要 |
| gen. | if only | 只要…就好了 |
| gen. | if only | 但愿 |
| gen. | if only | 只要…就好了 |
| watchm. | If you buy with an investor's mindset, only two brands are immune to fashion and depreciation in the long term: Patek Philippe and Rolex | 如果你以投资的心态购买，只有两个品牌不会受到潮流左右，长时间过后也不会贬值，那就是百达翡丽和劳力士 |
| busin. | If you desire earlier delivery, we can only make a partial shipment | 如果您想要尽早发货，那我们只能分批装运了 |
| telecom. | if-and-only-if | 等同 |
| gen. | I'll check to see if there's any space left. Luckily, only one left. Mind you, boarding time is 9:20 am | 我查查看还有没有空位。很幸运，还剩一个。请注意，登机时间是上午9点20分 |
| gen. | I'm awfully sorry. The only thing we can do is to contact CAAC office in Paris. Maybe they will wait for you if you are not too late | 非常抱歉。我们唯一能做的就是联系巴黎的中国民航办事处。如果没有迟到很久，也许他们会等你们的 |
| math. | only if | 只有当…才 |
| math. | only if | 只有在…的时候才 |
| math. | only if | 唯一的条件是… |
| math. | only if | 只要当…时才 |
| busin. | only if authorized by the parties to such contract | 只有在合同各方授权的情况下 |
| f.trade. | only if duties are levied as per legal procedures | 依法纳税后方可 |
| gen. | The most serious consequence of excess UVR is malignant melanoma, which has high cure rates only if detected early | 过度紫外线辐射的最严重后果是恶性黑素瘤，只有早期发现，才有高的治愈率 |
| busin. | This is a trial order. Please send us 100 sets only so that we may test the market If successful, we will give you large orders in the future | 这是试销订单。请先仅给我们发100套，看看市场如何。如果反响不错，我们将大量订购 |
| proj.manag. | This is sustainable only if return on capital employed improves dramatically | 只有当已动用资本回报率 ROCE显著提高时、这种状态才能得以持续 |
| scient. | Water can carry away the soil only if it is flowing fast. | 水只有在流动很快时方能带走泥土。 |
| gen. | We can only change the foreign currencies listed on the foreign currency board. If you have other currencies to change, please go to the bank | 我们只能兑换外汇牌上的这些外币，其他外币您可以去银行兑换 |
| shipb. | We may accept your price only if you can make an earlier shipment. | 如果贵方能提前交货，我们才可接受贵方价格 |
| cosmet. | Whether your skin is dry, normal, or even oily, if you can only afford one skin care product, experts say, your dollars will be well spent on a good moisturizer | 专家表示，无论你的皮肤是干性、中性或是油性的，如果你只买得起一种皮肤护理用品，将钱花在品质好的润肤霜上将是最划算的 |
| econ. | You can depart from the approved drawing only if you have first obtained the approval from the engineer for your amended drawing | 只有事先得到工程师对你的修改图纸的同意，你才可以不遵照已批准的原图纸 |
| gen. | You can't be brave if you've only had wonderful things happen to you. | 若是人生一帆风顺，你怎会勇敢。 (Mary Tyler Moore 玛丽•泰勒•摩尔) |