我有了头痛的先兆。I had the beginnings of a headache.乌云是下雨的明显先兆.Black clouds are an unmistakable sign of coming rain.那被认为是一种不幸的先兆.It is said to be an omen of misfortune....
In there compounds, the cyclopentadiene ring has only four hydrogens.在这些化合物里, 环戊二烯环只有4个氢.The cyclopentadiene is prepared by the thermal cracking of dicyclopentadiene.以热裂解双环戊二烯的方法制备环戊二烯.The chemistry of cyclopentadiene or...
-- But thou wilt see her now with other eyes.—— 但现在你要用另一副目光来见她." Wilt thou let me be at peace, if I once tell thee? "“ 要是我告诉你,你肯不肯让我安静安静? ”" Thou thyself wilt see it, one time or another.“ 总有一天,你自己会看到的....