第一个竞争者：一把遮阳伞，他们用分光光度计来评估紫外线是否通过。

First contender: a beach umbrella, which they evaluated with a spectrophotometer to see if UV rays passed through.

youdao

第一个竞争者：一把遮阳伞，他们用分光光度计来评估紫外线是否通过。

First contender: a beach umbrella, which they evaluated with a spectrophotometer to see if UV rays passed through.

youdao