It is not easy to be systematic and objective about language study.
系统、客观地看待语言学习并不容易。
A number of techniques developed since the 1950s, however, have placed the study of these subjects on a sounder and more objective footing.
但是,自二十世纪五十年代以来一些技术的发展为这些学科的研究提供了更健全、更客观的基础。
The objective is to study the impact of extra water on the immune system in mice.
目的是研究多余的水对老鼠免疫系统的影响。
应用推荐