英语语法分析

HBV serums were all negative.

乙型肝炎血清全部阴性。

At home creams, serums, cleansers etc in concentrations up to 15%.

在家里面霜，血清，清洁等，在浓度高达15 %。

The difficulty is getting the snake bit victims to the serums in time.

困难的是要让被毒蛇咬到人能及时注射抗毒血清。