tractor拖拉机，牵引车 例句：Jack's brother is a tractor driver.杰克的哥哥是一个拖拉机手。borrow trouble杞人忧天；自寻烦恼  例句： Don't borrow trouble by worrying about next year. 不要为明年的事儿瞎操心了。I'll put my best foot forward.我将全力以赴。  对话：A: Can you beat yout opponent?B: I can't make a promise, but I will put my best foot forward.　A：你能打败你的对手吗？B：我无法保证。但我会全力以赴的。