The academy has pushed back the age for the first of three hepatitis-B shots, which also contain thimerosal, from birth to two to six months in children whose mothers test negative for the disease.是什么意思_The academy has pushed back the age for the first of three hepatitis-B shots, which also contain thimerosal, from birth to two to six months in children whose mothers test negative for the disease.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句