古口首次由Evitt于1961年提出，它是存在于现代和化石的沟鞭藻孢囊壁上的一个特殊的开口。古口——孢囊在脱囊时，通过壁上一块或几块板片的失去形成一开口，原生质即通过此开口流出，继而形成新的动细胞，从而结束生活周期中的休眠阶段。多数种孢囊的古口具有一定的形状且分布于一定的位置。
威廉姆·马歇尔在影片中饰演了一位非洲王子Mamuwalde，德古拉将他咬伤转化为吸血鬼并封印在一口棺材之中，当他重获自由时已是20世纪70年代。
William Marshall stars as Mamuwalde, an African prince transformed into a vampire and then imprisoned in a sealed coffin by Count Dracula, only to find himself released in the 1970s.
分析了华南东部茅口亚统和吴家坪阶的岩相古地理分区及厚度变化，在此基础上对几个有争论的问题进行了讨论。
The Lithofacies paleogeography and the thickness variation of Maokouan Subseries and Wuchiapingian Stage in east part of South China are analyzed and some questions in dispute are discussed.
翰·里德的专横霸道、他姐妹的高傲冷漠、他母亲的厌恶、仆人们的偏心，像一口混沌的水井中黑色的沉淀物，一古脑儿泛起在我烦恼不安的心头。
All John Reed's violent tyrannies, all his sisters' proud indifference, all his mother's aversion, all the servants' partiality, turned up in my disturbed mind like a dark deposit in a turbid well.
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