I'm not sure, if you can not find them on the rack, they might be out of stock.

我不确定，如果你在货架上找不到，那可能缺货了。

youdao

Up on my rack, it was evident that the tech at that shop had made up the lines from bulk stock.

我的机架上，很明显是在该店技工从大量的库存中制作了刹车管路。

youdao

Salesperson: I'm not sure. If you can't find them on the rack, they may be out of stock. But let me look in the stockroom.

店员：不是很确定。如果鞋架上没有的话，可能已经卖完了。不过我先确认一下仓库中还有没有。

youdao

This is comparable to a higher end off -the-rack steel bike, and less expensive than buying a stock steel frame from a prestigious Italian manufacturer like Colnago and building it up.

FORBES: Why You Need a Custom Road Bike