老师画了一个图显示血液如何流过心脏。

The teacher drew a ___diagram showing how the blood flows through the heart.

该图显示了为建筑行业生产砖块的生产系统。

The ___diagram shows the system of production by which bricks are produced for the building industry.

一个简单的图表常常能解释复杂的想法。

A simple ___diagram can often explain complex ideas.