The actual application shows that control system based on S7-200 is cheap, economical and highly reliable.

实际应用表明由S7-200构成的控制系统具有成本低廉、经济实用，可靠性高等特点。

youdao

Not only do they have an endearing look but they're cheap to run, they are economical to build and perfect for nipping about town.

CNN: A design classic

The power in Iceland to do this is so cheap that it is economical for companies like Alcoa and Alcan to ship the raw materials all the way to Iceland and then ship the final product out it to its customers.

CNN: Can Iceland's geo-thermal power re-heat its economy?