正如我之前提到的，ULD已经产生了很长时间了，但是直到今天，为了使用它，你必须要研究很多个体砂石，而且要等待很久才能得到结果。
Like I said before, ULD has been with us for a while but until recently, in order to do it, you really had to study many individual grains and it took a long time before you got results.
正如我之前提到的，ULD已经产生了很长时间了，但是直到今天，为了使用它，你必须要研究很多个体砂石，而且要等待很久才能得到结果。
Like I said before, ULD has been with us for a while but until recently, in order to do it, you really had to study many individual grains and it took a long time before you got results.
应用推荐