In some parts of the world, cyclists have been powering safety lights for years with devices called bicycle dynamos, which use a generator to create alternating current with every turn of the wheels.

在世界的一些地方，骑自行车的人已经通过叫自行车发电机的装置产生了多年的安全电能。当自行车车轮转动的时候一个装在上面的发电机就会产生交流电。

youdao

Enough people will want enough more than simple subsistence that the wheels of the world will keep turning even if we charitably assume that slackers might be suffering from undiagnosed mental illness.

FORBES: We Won't Get Ahead By Taxing Warren Buffett More -- Jennifer Aniston, Maybe

His co-driver, Tracy, is a Guinness Book of World Record holder for completing the Hot Wheels Double Loop Dare at the 2012 X Games.

FORBES: Connect

We can't afford to spin our wheels while the rest of the world speeds ahead.

WHITEHOUSE: Meeting with Governors on Energy Policy