Only $40, which would buy an 8-GB SD card.
这只要40美元。 但是你花这个价钱能买一个8GB的SD卡。
Mehods: A morphometric study was made in 40 SD rats by light and electron microscopic technique, as well as stereological method.
方法：采用光、电镜技术和体视学方法对40只SD大鼠弓状核神经元的昼夜节律变化进行了形态定量研究。
MethodsHealthy SD rats 40, half male and half female, were randomly divided into normal group, sham-operated group, model group, electro-acupuncture group.
方法取健康SD大鼠40只，雌雄各半，随机分为正常组、假手术组、模型组、电针组。
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