尽管面临挑战，两种登革候选疫苗已在登革热流行国家进行后期临床评价，一些其他候选疫苗尚处在较为初级的开发阶段。
Despite these challenges, two vaccine candidates have advanced to evaluation in human subjects in countries with endemic disease, and several potential vaccines are in earlier stages of development.
尽管这项研究还处在非常初级的阶段，但是如果能改进完善，基于碳纳米管的电池将可以提供一种更有效的方法将光转化为电能。
Though still in the very early stages of development, if perfected, carbon nanotube-based cells could provide a more efficient method of converting light to electricity.
在所有国家中，初级卫生保健提供了一种方法以便提高获取卫生保健方面的公平性以及资源使用方面的效率。
In all countries, it offered a way to improve fairness in access to health care and efficiency in the way resources were used.
应用推荐