请提供一些中文的表达式或者成语，场景是当有人帮了我们大忙。要求至少提供4个表达式，每个表达式占据一行，每个表达式后面需要加上它的英文解释。
user
投笔从戎  
(Drop one's pen and join the army: Figuratively, to give up a civilian career and join the military. However, it can also mean to leave an easy job for a more challenging one, but it doesn't perfectly fit the context of expressing gratitude for receiving great help.)  
恩同再造  
(A favor as great as a second creation: This expresses deep gratitude toward someone who has done you a great kindness or helped you in a crucial situation.)  
鼎力相助  
(Give strong assistance: This phrase is used to express that someone has given their utmost support, which often leads to success or overcoming difficulties.)  
雪中送炭  
(Deliver charcoal in the snow: This metaphorically means to render help in a timely fashion, especially when someone is in great need.)
assistant