It mixes the sounds of hard punk and heavy metal rock and roll.

VOA: special.2009.11.06

Sometimes it's easier actually not touch it to the metal, -- I should have- TA: It's hard to see if it's moving or not.

有时候它更容易不接触金属，我本应该-,助教：很难看到它是否移动了。

麻省理工公开课 - 化学原理课程节选

But at the end of the day, if you move this metal thing aside with your fingers, don't squeeze it too hard.

但是在下课后，如果你用手指触碰这个金属块，不要用力过猛。

哈佛公开课 - 计算机科学课程节选

Throw away damaged metal cans or hard plastic containers.

VOA: special.2010.07.19