Gears help them change speed — like on a bicycle.
齿轮帮助他们改变速度——像自行车一样。
Life is like a ten-speed bicycle. Most of us have gears we never use.
人生如同变速自行车，很多档，很多人都不曾用过。
Easy to change speed by gears.
易于改变齿轮的速度。
In a vehicle with manual transmission, shift gears as you increase speed.
手动档车辆，应即时加速换档。
Now both the side gears and axle shafts move at the same speed.
现在两个半轴齿轮和半轴的转速相同。
Life is like a 10-speed bike. Most of us have gears we never use.
人生像是一台10段变速脚踏车，大多数人都有没用到的排档。
Choose proper gears; avoid low gears for high speed;
选择合适档位，避免低档跑高速；
Choose proper gears; avoid low gears for high speed;
选择合适档位，避免低档跑高速；
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