积累一个外刊地道表达——building blocks
📙《Signals and Systems》
✨ 外刊原句：
They are for us as building blocks for general signals and descriptions of systems.
它们对于我们而言，是构成一般信号与系统描述的基石。
🌠 building blocks | 名词短语 (n. phrase)
中文释义：基石；基本构成单元
英英释义：the basic things that are put together to make something exist.
