石蕊的英文：
reindeer moss
(chem.) litmus (as in litmus paper)

参考例句：

Chalk blood yeast dextrose litmus milk
白垩、血、酵母浸膏石蕊牛乳(培养基)

Litmus： Mixture of coloured organic compounds obtained from several species of lichens.
石蕊:从几种地衣类植物中获取的带色有机化合物的混合物。

reindeer是什么意思：
n. 驯鹿

The herd of reindeer was being trailed by a pack of wolves.
那群驯鹿被一只狼群寻踪追赶上来。

The herd of reindeer was being trailed by a pack of wolves
那群驯鹿被一只狼群寻踪追赶上来。

Rudolph the Red Nosed Reindeer, and Frosty the Snowman.
《红鼻子驯鹿鲁道夫》和《结霜的雪人》。

moss是什么意思：
n. 苔藓；泥沼
v. 以苔藓覆盖；使长满苔藓

A rolling stone gathers no moss.
滚动的石头不生青苔(经常漂泊不定的人难有钱财或成就)。

A rolling stone gathers no moss
滚石不生苔

The wall was patched with moss.
墙上长着斑斑点点的青苔。

chem是什么意思：
n.化学

Representative oily soil compositions are more easily mede up from pure chem ical ingredients.
有代表性的油质污垢，则比较容易用纯化学品成分配制。