筚路褴褛

zhū jūn zhī zǔ xiān céng yǐ dà wú wèi zhī jīng shén mào bù kě sī yì zhī kùn nán bì lù lán lǚ yǐ kāi fā xīn dà lù

诸君之祖先曾以大无畏之精神，冒不可思议之困难，筚路褴褛以开发新大陆。

Their brawn and thews braved undauntedly almost unbelievable hardships to open up a new continent.