那套装置肯定挺重，操作它的人把管子扛在肩上以保持稳定。
The device must have been unwieldy; the man rested it on his shoulder to steady it.
尽管子项列表和属性列表的操作方式相似，但一个可以包含重复项(对象的子项)，而一个不能(元素对象的属性)。
While the list of children and the list of attributes operate similarly, one can contain duplicates (the children of an object) and one cannot (the attributes of an element object).
型滑管：靠滑动操作的部分，如长号上u型的管子部分，拉动它可以产生各种声调。
A part that operates by sliding, as the U-shaped section of tube on a trombone that is moved to produce various tones.
应用推荐