半导体是什么东西:tried as he is ,he is sitll on duty的中文意思

tried as he is ,he is sitll on duty的中文意思 Young man as he is,he knows a lot. he is standing to attention as I walked from the house.中stand to attention 是什么意思？ the old man is not as much of a help as i thought he would be的中文意思是什么? I donot think he that he is right "As he was very tried, he nodded over his reading." 问“OVER”在这里是什么意思？ He earns twice as much as I do. i bet he is tighty whitey guy i donot think he who is right I think he is an English.