He walks or bikes to the office every day.

他每天步行或者骑脚踏车去办公。

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Back then there were no cars or bikes.

那时候没有小汽车，也没有自行车。

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Computer simulations that take all of these factors into account could lead to improved designs for folding bikes with small wheels or bikes that carry cargo, Ruina says.

计算机模拟能把这些因素进行综合考量。这能改进设计出可折叠或是能拉货的自行车。

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Johnson says he has learned from mistakes made in Paris, where many of the bikes were stolen or thrown into the river.

VOA: standard.2010.07.30

The Looxcie HD video cam will be available in several configurations - including the Looxcie HD Explore, which features versatile mounting options for ball caps, helmets or bikes, making it easy to record and stream hands-free right out of the box.

ENGADGET: Looxcie HD brings 1080p and WiFi streaming to a helmet near you

As he explains, power-assisted bikes are either great electric bikes or great pedal bikes, but rarely both.

ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt

And for those who do not mind branding themselves as tourists, the popular MacBike offers locations throughout the city and even has bakfiets - or cargo bikes - for rent (great for hauling kids or souvenirs).

BBC: Amsterdam on wheels