第二种理论——很可能是一个荒诞的都市说法——几个州担忧的父母提议禁止使用金属午餐盒，声称孩子们会把它们当作“武器“来互相攻击。

The second theory—possibly an urban myth—is that concerned parents in several states proposed bans on metal lunch boxes, claiming kids were using them as "weapons" to hit one another.

youdao

您已经建设了一支强大的航空母舰战斗编队，每次攻击都能够征服敌方都市。

You have built a powerful Aircraft Carrier battle fleet capable of conquering enemy cities in a single attack.

youdao

所以如果你想攻击都市的空气质量，这可能是一个错误的方向，对吗？

So, if you want to attack urban air quality, this is probably moving in the wrong direction, OK?

youdao

So, if you want to attack urban air quality, this is probably moving in the wrong direction, OK?

所以如果你想攻击都市的空气质量，这可能是一个错误的方向，对吗？

麻省理工公开课 - 固态化学导论课程节选