哲理文章青春的飞逝？ 青春的飞逝 The Flight of youth Richard Henry Stoddard/理查德.亨利.斯托达德 There are gains for all our losses. 我们失去的一切都能得到补偿， There are balms for all our pain; 我们所有的痛苦都能得到安慰； But when youth,the dream,departs 可是梦境似的青春一旦消逝， It takes something from our hearts, 它带走了我们心中的某种美好， And it never comes again. 从此一去不复返。 We are stronger, and are better, 我们变得日益刚强、更臻完美， Under manhood’s sterner reign; 在严峻的成年生活驱使下； Still we feel that something sweet 可是依然感到甜美的情感， Following youth, with flying feet, 已随着青春飞逝， And will never come again. 不再返回。 Something beautiful is vanished, 美好已经消逝， And we sigh for it in vain; 我们枉自为此叹息； We behold it everywhere, 尽管在天地之间， On the earth, and in the air, 我们处处能见青春的魅力， But it never comes again! 可是它不再返回！ 发现 Discovery Diane Ackerman/迪安.阿克曼 The word “discovery” literally means, uncovering something that’s hidden from view. But what really happens is a change in the viewer. The familiar offers comfort few can resist, and fewer still want to disturb. But as relatively recent inventions such as the telescope and microscope have taught us, the unknown has many layers. Every truth has geological strata, and you can’t have an orthodoxy without a heresy. The moment a newborn opens its eyes, discovery begins. I learned this with a laugh one morning after delivering a calf. When it lifted up its fluffy head and&n bsp;looked at me, its eyes held the absolute bewilderment of the newly born. A moment before it had the even black nowhere of the womb, and suddenly its world was full of colour, movement and noise. I’ve never seen anything so shocked to be alive. “发现”一词，字面上是指揭开某种视线以外的隐藏的事物。 不过其实是观察者自身发生了变化。 很少人能抗拒熟悉事物带来的舒适，愿意扰乱这种舒适的人更少。然而，正如望远镜、 显微镜 这些较为近期的发明所揭示给我们的，求知事物具有多种层次。每个事实都有地质层次 ，没有异端也就无所谓正统。 新生儿睁开双眼的那一刻起，发现也就开始了 。我是在一天清晨给一头小牛犊接生的时候突然意识到这一点的，不禁大笑。 小牛仰起毛茸茸的脑袋看着我，目光中透出这个新生命对世界的一无所知。 片刻这前，它还呆在母体里某个黑暗而平静的地方，突然，它的世界变得五光十色， 变得活泼而喧闹。我从未见过任何东西在获得生命时是如些的惊异。 查看更多0个回答 . 2人已关注
蒸馏模拟回流比为负？ 我在用DSTWU模型模拟 乙醇 蒸馏时，得到的回流比为负数，塔板数都小于1，请教各位是哪出问题了。 计算结果如下： Minimum reflux ratio: 0.1（ASPEN自动修改为0.1，计算结果为负） Actual reflux ratio: 5 Minimum number of stages: 1.03117969 Number of actual stages: 1.15228533 Feed stage: 0.85822773 Number of actual stages above feed: -0.1417723 Reboiler heating required: 140126.913 cal/sec Condenser cooling required: 104921.043 cal/sec Distillate temperature: 375.085607 K Bottom temperature: 405.991269 K Distillate to feed fraction: 0.12832068 HETP:查看更多6个回答 . 1人已关注
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