努力与艾滋病做斗争并给需要的人们送去价格便宜的药物；
to fight AIDS and bring low-cost medicine to those who need it;
当浏览器出现在我们的智能手机上时，我们能很快就能在商店里找到需要的商品，并且找出最便宜的价格。
As soon browsers arrived on our smart phones, we immediately began searching for products we saw in-store, hoping to find better prices.
但是传统意义上来讲，要制作那样的地图所需要的传感器不是体积大、价格贵就是虽便宜但精确度太低。
But the sensors required to build that map have traditionally been either expensive and bulky or cheap and inaccurate.
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