这家商店的面包是自制的，所以便宜。
Bread is cheap in this shop because they bake it themselves.
便士报之所以便宜是因为商业机构为做广告付钱给报纸。
The penny press cost so little because businesses paid to advertise in the newspapers.
他两分钟就能搞定，时间成本低，而且也就是一块闸皮的事儿，材料成本低，所以便宜。
He finished it only two minutes, cost a little time, and only a piece of brake lining, a little material, so it's cheap.
他两分钟就能搞定，时间成本低，而且也就是一块闸皮的事儿，材料成本低，所以便宜。
He finished it only two minutes, cost a little time, and only a piece of brake lining, a little material, so it's cheap.
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