You know, 10 years sounds like an awful long time.你知道，10年听起来遥遥无期。He's in an awful jam over his marriage.他因婚事而陷入极大的困境。Compiling a dictionary is an awful sweat.编字典是一项非常艰苦的工作.Tim, this is awful. I know what you must th...
每种动物都有自己的生态位.Each animal has its ecological niche.生态位: 生物体所占据生境的最小单位.Niche: Smallest unit of a habitat that is occupied by an organism.生态位战略之二是生态位分离和生态位扩充战略.Second niche strategy is niche separation and niche expansion s...