典型的布局型钢包括工字钢 、 槽钢 、 三角铁和丁字钢.Typical structural steel shapes include beams, channels, angles and tees.三角铁是一种很容易掌握的简单乐器.A triangle is a simple instrument to master....
Excuse me interrupting, but there's a thing I feel I've got to say.抱歉打断一下，我觉得有件事我得说。Pardon me for interrupting.对不起打断一下.They also have the irritating habit of interrupting.他们还有打岔的烦人习惯。a level, narrow stretch of ...