三月三十一日，一项前所未有的广播在线服务悄然问世，内容的广度和深度都在急速扩展。
A groundbreaking online service launched quietly on March 31st is growing quickly, both in content and sophistication.
根据主题扩展的深度和广度，主题学习模式又可细分为主题课程和主题单元。
According to expand the depth and extent of theme, theme learning mode and can be divided into topics and themes unit.
目前，对袁宏道研究的广度和深度在不断扩展。
At present, the scope and depth of studies on Yuan Hongdao are expanding continually.
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