from the shallower to the deeper;go from the easy to the difficult and complicated ;

His lectures always proceed from the close to the distant and from the elementary to the profound.
他讲课总是由近及远,由浅入深.
来源:《现代汉英综合大词典》Besides , contents was chosen and the order was reasonably arranged.
精选教学内容,合理安排实验顺序, 由浅入深,循序渐进.
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