He's been studying the chimps every day for the last 15 years... 15年来 汤姆每天都在研究黑猩猩
Uzma has been studying the last remaining population for over 20 years. 20年来 乌兹玛一直在研究印度河豚的种群数量
And they do that by studying others. 通过观察来学习
Scientists studying the brightest fungi in the world 科学家研究了世界上最亮的蘑菇