xǔ / duō / gōng / sī / réng / zài / shǐ / yòng / bì / yuán / xì / tǒng / lái / bǎo / hù / shāng / yè / dài / mǎ

许多公司仍在使用闭源系统来保护商业代码。

Many companies still use closed-source systems to protect their proprietary code.