图像分析表明，气血屏障的厚度，随胎龄的增长而变薄。
The thickness of blood-air barrier was measured by image analyzer.
机体微量元素中铁的含量随牛蛙日龄增长而显著下降，幅度达6842 ％ ；铜、锰、锌的含量则相对稳定。
In the trace elements of body, the content of Fe was decreased 68.42%, and the level of Cu, Zn, Mn were stable, with the …
机体微量元素中铁的含量随牛蛙日龄增长而显著下降，幅度达6842 ％ ；铜、锰、锌的含量则相对稳定。
In the trace elements of body, the content of Fe was decreased 68.42%, and the level of Cu, Zn, Mn were stable, with the …
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