订货量的英文：
purchasing quantity

"Ok, if your order is over 500 tons, we can give you a discount of 3 percent. "
这样吧，如果你的订货量超过500吨，我们可以给你3%的折扣。

purchase freedom with Blood
以血的代价赢得自由

This orchard became ours by purchase.
这个果树园被我们买下了。

such as stores requisition, purchase requisition,
像库存调拨单，购物申请单，

He purchased this stamp at an auction.
他在拍卖会中购得这枚邮票。

Their purchase is purely a paper transaction.
他们的购买完全是纸上交易。

dimensionless quantity
无因次值|无量纲的量

Bill of quantities: The specification of the quantity of materials to be used.
工程量清单;建筑工程清单;数量清单:指项目所用材料的数量及其规格的清单。见priced bill of guantities

Quality is better than quantity
不求其多,但求其精

We prefer quality to quantity.
我们要的是质量而不是数量。

These quantities are called stress resultant.
这些量叫做合应力。