lǎo yī bèi / kē xué jiā / wèi / zǔ guó / de / fā zhǎn / lì xià / le / bù xiǔ / de / wěi yè

老一辈科学家为祖国的发展立下了不朽的伟业。

The older generation of scientists made immortal achievements for the development of the motherland.