per mu yield的用法和樣例：
例句
- Due to the bad weather,cotton yield poer mu is very low this year.
由于天氣不好，今年棉花的畝產(chǎn)量很低。 - The yield is over 1,000 jin per mu.
畝產(chǎn)過(guò)千斤。 - A farmer told me once that it was a big problem to explain how some small farms were getting higher yields per acre than the big farms.
有一次一位農民告訴我，要解釋一些小農場(chǎng)畝產(chǎn)比大農場(chǎng)要高真是個(gè)大問(wèn)題。
