what's the meaning of "a hard blue" and "a hard smile"? i'd like to know more about the usage of "hard" in english idiom .thank you!

help me again please to translate these sentences,thank you ! the chicago amphitheater was packed,sweltering,rocking.onstage,Mick Jagger of the Rolling-Stones was singing 'Midnight Rambler',Critic Don Heckman was there when the song ended,"jagger"he said,grabs a half-gallon jug of water and runs alongthe front platform,sprinkling its contents over the first few rows of weltering listeners.They surge to follow him,eager to be touched by a few baptismal drops.

help me to translate these sentences ,thank you ! All this and many other things remain almost as much a mystery as they were when the French explorer Du chaillu first described the animal to the civilized world a century gao. The Abominable Snowman who haunts the imagination of climbers in the Himalays is hardly more elusive.

who can offer a speech about the reform and opening-up for 30years? 谁能帮我提供一份关改革开放三十周年的演讲稿？谢谢

help me to translate "我是福建教育学院的学生会主席”

who can tell me the diffience between "while" and "when"? How to use them in a subordinate clause? give me some examples.Thank you.