Cucurbituril is a macrocyclic cavitand compound with two portals.葫芦脲是一种具有大环空腔、两端开口的葫芦状分子.All these novel macrocyclic compounds were confirmed with elemental analysis, IR, 1 HNMR and MS.这些新型大环化合物均经元素分析 、 IR 、 1HNMR、MS等证实其...
学校之间不应该相互竞争，也不应该企图挖走彼此的学生。Schools should not compete with each other or attempt to poach pupils.双方都愿意体谅彼此的政治敏感问题。Both sides are willing to make allowances for each other's political sensitivities.以前每次狂欢派对过后，我们都会到彼此的...
我们常常举出这样一系列形状不同,然而具有相同光焦度的透镜,作为透镜的配曲调整的例子.One often speaks of this succession of shapes having the same power as exemplifying lens bending.用同样的方法,我们能够求出任意数目的薄透镜的响应.In this same way we could compute the response of any nu...