right angle bracket

例句：

1. 1.The right angle bracket is used to close the gap between two pieces of paper.
   直角括号用于闭合两片纸之间的间隙。
2. 2.In mathematics, a right angle bracket is used to denote an angle that measures 90 degrees.
   在数学中，直角括号用来表示一个角度，该角度测量为90度。
3. 3. The engineer used a right angle bracket to reinforce the beam before it was assembled.
   工程师使用直角括号加固了梁，使其在组装前得到加强。