一臂之力 a helping hand
Explanation
比喻尽力帮助，出一点力量。
It means to do one's best to help, even if it's only a small contribution.
Origin Story
从前，在一个繁华的集市上，一位老奶奶正在摆摊卖水果。她辛苦地挑着担子，却总是卖不出去，眼看着天色渐晚，老奶奶愁眉苦脸，眼看就要空手而归。这时，一位路过的年轻小伙子看到老奶奶的困境，便主动上前询问，了解到老奶奶是因为体力不支，无法叫卖，便热心地帮老奶奶吆喝起来，还帮老奶奶把水果搬到人流量更大的地方。最终，在小伙子的帮助下，老奶奶的水果全部售罄，老奶奶喜笑颜开，连连感谢小伙子的帮助。小伙子只是笑了笑，说道：“举手之劳，不用谢。”
Once upon a time, in a bustling marketplace, an old lady was setting up a stall to sell fruits. She carried her load with difficulty, but she was always unable to sell anything. As dusk approached, the old lady looked worried, it seemed like she was about to go home empty-handed. At that moment, a young man passing by saw the old lady's predicament, and went up to her to inquire. Knowing that the old lady was too tired to shout, he enthusiastically helped her shout, and even helped the old lady move her fruits to a place with more traffic. Finally, with the help of the young man, the old lady sold all her fruits, and the old lady was overjoyed and thanked the young man repeatedly. The young man just smiled and said, "It's not worth mentioning."
Usage
在请求别人帮助的时候，可以用这个词语，表示希望对方能够提供一点帮助。
This word can be used when asking someone for help, to show that you hope the other person can provide some help.
Examples
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为了完成任务，我需要你的帮助，希望你能助我一臂之力。
wèi le wán chéng rèn wù, wǒ xū yào nǐ de bāng zhù, xī wàng nǐ néng zhù wǒ yī bì zhī lì.
To complete the task, I need your help, I hope you can lend me a hand.
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他年纪虽然不大，但在工作中却能独当一面，真是令人刮目相看，我想他日后一定能成为企业的中流砥柱。
tā nián jì suī rán bù dà, dàn zài gōng zuò zhōng què néng dú dāng yī miàn, zhēn shì lìng rén guā mù xiāng kàn, wǒ xiǎng tā rì hòu yī dìng néng chéng wéi qǐ yè de zhōng liú dǐ zhù.
He is not very old, but he can work independently in the job, which is impressive, I think he will become a pillar of the company in the future.
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他虽然不能像老员工那样，为公司贡献全部力量，但他愿意贡献自己的一臂之力，这种精神值得我们学习。
tā suī rán bù néng xiàng lǎo gōng zuò yuán nàyàng, wèi gōng sī gòng xiàn quán bù lì liàng, dàn tā yuàn yì gòng xiàn zì jǐ de yī bì zhī lì, zhè zhǒng jīng shén zhí dé wǒ men xué xí.
Although he cannot contribute all his strength to the company like the old employees, he is willing to contribute his part, this spirit is worth learning from.