一个老师应真正热爱其工作，这种真热爱会让课堂更加生动有趣。
A teacher must love her job. If she really enjoys her job that'll make the lessons more interesting.
纤毛虫是单细胞的原生动物，在进化上属于低等的真核生物，但其各细胞器之间囊泡运输系统极为完善。
Ciliate, a unicellular protozoa and low eukaryotes in evolution, has perfect vesicular trafficking system among organelles.
而腔肠动物的出现标志着真后生动物的开始，在生物起源演化历程上占据着极其关键的位置。
Therefore, it has the prominent position in the origin and evolutionary history of organisms. Perhaps the star-like organism represents the early types of coelenterate with original tentacles.
而腔肠动物的出现标志着真后生动物的开始，在生物起源演化历程上占据着极其关键的位置。
Therefore, it has the prominent position in the origin and evolutionary history of organisms. Perhaps the star-like organism represents the early types of coelenterate with original tentacles.
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