researcher n.研究员,科研工作者
Finding a cure for AIDS is one of the biggest challenges facing medical researchers.
找到治愈艾滋病的方法是医学研究人员面临的最大挑战之一。
Researchers began with a simple study.
研究员开始了一个简单的研究。
course n.过程,进展;航向,行动方向;行为做法;道路,路线;课程,科目:一道菜; 追踪狩猎 V.沿特定路线行进;迅速越过;迅速流动;追踪狩猎
to take/do a course in art and design
攻读美术与设计课程
Many students drop out of online courses because of the lack of teaching support.
许多学生因缺乏教学支持而退出在线课程。
specimen n.样本，标本，样品;(化验的)血样、尿样等
Can you give me a specimen of youn handwriting?
你能给我一份你笔迹的样本吗?
Many of the best specimens may be seen today at museums of natural history in the largest cities in the United States and Canada.
今天，许多最好的标本可以在美国和加拿大的大城市中的自然历史博物馆看到。
outing n.远足,(集体)出外游玩(或学习等) v.“out”的现在分词
a family outing 全家远足
excursion 远足短程旅行
excursive 散漫的
expedition n.远征,探险队,迅速
variation n.变化;变更;差异
There is a wide variation of opinion about the ways to deal with the pollution.
在处理污染的方式这个问题上，观点有了很大的 变化。
Whatever the case, your passport wil. likely be one of four colors: red, blue. green or black, although there are slight variations.
但无论如何，你的护照颜色很可能是下列四种之一:红、蓝、绿或黑色，尽管颜色可能有些许不同。
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