对照品的英文：
reference substance

reference是什么意思：
n. 提到，谈及；参考，查阅；证明人，介绍信
v. 查阅；参考；给（书）等附参考资料

The headmaster supplied him with a reference.
校长给他提供证明人。

You can refer to a dictionary if necessary.
如果有必要，你可以参考字典。

No referring back to books and notes!
不准看书和笔记！

The department that you are refering to is not in existence.
你所指的部门不存在了。

The choice of the reference temperature is inconsequential
基准温度的选择是无关紧要的。

substance是什么意思：
n. 物质；实质；主旨；资产

Concentration of a substance in solution or the strength of such a substance determined by titration.
滴定度用滴定的方式测定的一种物质的溶液浓度或这种物质的浓度

It's a material of substance.
那是一种坚固的材料。

To spot or stain, as with a discoloring substance.
玷污，弄赃因某种褪色物质弄脏、染污

Petrol is a volatile substance.
汽油是挥发性物质。

This substance increases pain tolerance.
这种物质增加对疼痛的耐受性。