Mammals arose from a fairly primitive reptile in the Mesozoic era.哺乳类起源于中生代宛若原始的爬虫类.They attracted the attention of every bird within eyeshot, every reptile not yet asleep.它们就把所有目力见得着的鸟儿,和所有还没入蛰的爬虫, 都引得注意起来.A crocodilian...
The fluid can be drawn off with a syringe.可用注射器将液体汲出。To suction with a bulb syringe, push bulb in with your thumb.用球吸引器时先用拇指把球压扁.A bulb syringe is often used for oral and nasal suction on infants and children.常常使用球吸引器抽吸婴...