供需关系的英文：
relation between supply and demand
Supply-demand relation

relation是什么意思：
n. 关系；亲戚（关系）；关联，联系

incidence relation
关联关系

Curious to relate, the giraffe has no voice.
说来奇怪，长颈鹿不会出声。

Of, relating to, or being a real number.
实数的实数的、是实数的或与实数有关的

between是什么意思：
prep. 在...之间；私下；来往于…之间；由…分担（分享）；总共
adv. 在中间

Between ourselves
秘密地说

Interaction between systems or between properties of a system.
系统间或一个系统的各种特性之间的相互作用。

You have your choice between the two.
在这两个之中，你有选择权。

supply是什么意思：
v. 供给，供应；补充
n. 供给，供应；供应量，供应品；生活用品；生活费
adv. 柔韧地

Demand exceeds supply. The supply is not adequate to the demand．
供不应求

Furnish a village with supplies/furnish supplies to a village
供应某村庄生活用品

air-supply register
空气供应记录器