Ah, well, the Economics I course is a doubleunit so there are two lectures a week and one tutorial. The lectures are scheduled for Tuesday and Thursday.
我教的经济学课程是两个单元，所以一个星期有两次课一次辅导。课安排在星期二和星期四。
2
That is, according to the atoms of solid structure have or haven′t periodic arrangement, crystal can be classified to single unit cell crystal and doubleunit cell crystal.
按照晶体结构中原子是否有周期性重复排列将晶体分成了单胞晶和双胞晶两大类。
3
This mining technology combined the fully mechanized mining with orthodox working face, and it layoutted irregular form and doubleunit face, adopted the rotational adjustment mining.