这些障碍物对于想要往上游游动的鱼儿来说是致命的。The barriers are lethal to fish trying to swim upstream.他在那里有一栋房子，但在河上游几英里处。He has a house down there but it's miles up river.上游的城市将污水排放到河里。Cities upstream use the river to get rid of sewage....
The dynamic SIF variation was found to lag behind the stress - pulse impingement by several microseconds.人们发现,动态应力强度因子的变化滞后于应力脉冲冲击几微秒.Shoulder impingement syndrome is one of the most common painful shoulder disorders.肩夹击...