我的心愿是当科学家

玉与玛瑙如何鉴别在我眼里玉和玛瑙都是晶莹剔透.要怎么才能鉴别出玉和玛瑙呢.当然我这里是说的不用任何器械的.就是就一般的眼法和常规手段. 帮忙鉴定是不是玛瑙原石 风萧萧兮易水寒 这句话最早的出处在哪里? 风萧萧兮易水寒这句话表达了什么 武则天女儿叫什么 family是什么意思 Family 是啥意思 takes,at,my,shower,usually,9:00,a,brother连词成句 My brother （takes） a shower every evening.A has B gets C does 连词造句：my.little.a.shower.brother.takes.every.day It begins with it is a building.we go there to watch a playit begins with "t"what is it 我弟弟通常在晚上做作业 My brother usually ___ ___ ___ in the evening 缟玛瑙是什么 information with 有几种用法? 缟玛瑙的价位?有哪位大哥大姐知道在哪里能买到真的缟玛瑙?价位大概是多少呢? it begins with letter是什么意思 英语翻译The story begins with a girl who is looking for a place to stay and by chance intrudes闯入,侵入 i n an old woman's tatty破旧的,褴褛的,不值钱的Siheyuan on a snowing night it begins with us 主句一般过去时,从句一般现在时,He bought an old magic book,which bears many underlined handwritten remarks on the margin of many pages.我觉得,这里主句虽然是一般过去时,但是从句中这本书上的写过的评论一直存 连词成句 homework,in,can,the,you,your,study,do. 主句过去时为什么从句可以一般现在时?go for it中有一句"Mom and dad said they want to leave in 10 minutes",want为什么不是wanted? IF从句（一般现在时）,主句（一般将来时) IF (如果）.请问IF 译为如果 还有其他用法吗除虚拟语气外 连词成句homework in can the you your study do 金融学里的long position 和 short position是什么意思 有什么区别最好举几个现实的交易例子说明~ long or short是什么意思捏?长还是短不对,老师说的,米有语境,是单独的解释词组 SHORT&LONG I have such an appreciation for what it is to listen,to truly listen to the music.怎么翻译? what caused the Americans to live such a quick life?回答问题,（英文字数150）中文的也可以 he was just to ask what had made such a surprising change when the parrot went on saying,怎么翻译 迄今为止,已有多少个国家在南极洲建立了多少个科学考察实验站 英语“Practical joke” 是什么含义/ blue ocean stratery是什么?怎么体现创新精神?其影响是什么?