She had made their childhood so joyous and carefree.她使他们的童年充满欢乐，无忧无虑。After a joyous and restful three days, I left this beautiful city.度过了愉快轻松的3天后，我离开了这个美丽的城市。The lively dance heightened the joyous atmosphere of the scen...
烧瓶侧面有刻度标志.The graduations are marked on the side of the flask.把烧瓶放在火上.Put the flask over the fire.满至烧瓶颈部的有机层被抽吸进入原子吸收燃烧器中.The organic layer in the neck of the flask is aspirated into the atomic absorption burner....