In San Francisco, renting a bike is as expensive as taking a taxi. So you'd better travel by public transportation, unless you like riding a bike enough to justify the cost.
在旧金山租自行车几乎和乘汽车一样贵，如果你不是对它特别爱好，乘坐公共交通工具游览还是最好的选择。
Q. I was wondering if you could give me some suggestions of a small, light portable radio-type gadget with earbuds that would be good for me while I do athletic activities like riding my bike.
能不能给我推荐一种轻便小巧、带耳塞的便携式收音机那样的装备，以便我在运动时收听，比如说骑自行车。
One is aerobic exercise - any type of movement, like walking or riding a bike, that raises the heart rate and gets you breathing harder.
其中一种就是有氧运动：这是指任何可以提高心率加快呼吸的运动，比如步行或者骑自行车。
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