two-guard是什么意思

用法例句

Andanother group of 48 3 -month bipedal rats also renderment OVX and Sham-0 operation and sacrificed at 2,5,7th month later.

另职新生24～72小时雌性SD鼠48只,丝线结扎切除双前肢及尾根部,建立双后肢大鼠模型。