gōng chéng shī / xiān / huà chū / xì tǒng / de / fāng kuàng tú / zài / zhú bù / què dìng / gè ge / mó kuài / de / gōng néng

工程师先画出系统的方框图，再逐步确定各个模块的功能。

The engineer first drew a block diagram of the system and then determined the function of each module step by step.