在…下: under, with (the help of)
介词 / prepositions
Tone colorsā tone 1á tone 2ǎ tone 3à tone 4a neutral
在…下 marks the condition or influence under which something happens: "under the influence of", "with the help of", "under these conditions". The phrase opens the sentence.
The core noun is almost always abstract: 帮助、影响、支持、指导、压力、条件、情况. Don't confuse it with 在…上 ("in terms of", 在工作上) or 在…中 ("in the course of", 在学习中).
Examples
在老师的帮助下,他的成绩提高得很快。
Zài lǎoshī de bāngzhù xià, tā de chéngjì tígāo de hěn kuài.With the teacher's help, his grades improved quickly.
在经济全球化的影响下,很多企业开始走向海外。
Zài jīngjì quánqiúhuà de yǐngxiǎng xià, hěn duō qǐyè kāishǐ zǒuxiàng hǎiwài.Under the influence of globalisation, many firms are expanding abroad.
在这种情况下,我们只能降价。
Zài zhè zhǒng qíngkuàng xià, wǒmen zhǐ néng jiàngjià.Under these circumstances, we can only cut prices.
Common mistakes
✗ 在老师的帮助,… → ✓ 在老师的帮助下,… (don't drop 下).
✗ 在工作下 → ✓ 在工作上 (domain); 下 goes with influence/help/conditions.