The slow wagons of that time, usually drawn by horses, were too expensive for moving heavy freight very far.

那个时期的车厢通常是马拉的，很慢，把货物运送到遥远的地区要花很多的钱。

youdao

So while the HPV vaccine by itself is probably far too expensive to justify, if it's coupled with a larger agenda, laying the groundwork for decreasing maternal mortality and improving child health by reaching these girls before they become mothers, then perhaps we have a real breakthrough.

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