多年以来,治沙人前赴后继,终于让沙漠变成了绿洲。Duōnián yǐlái, zhìshārén qiánfùhòujì, zhōngyú ràng shāmò biànchéngle lǜzhōu.For many years, generations of desert-control workers pressed forward one after another, finally turning desert into oasis.
为了保护这条河,志愿者前赴后继地参加清理活动。Wèile bǎohù zhè tiáo hé, zhìyuànzhě qiánfùhòujì de cānjiā qīnglǐ huódòng.To protect this river, volunteers joined the clean-up activities one wave after another.
创业的路上虽然艰难,年轻人仍然前赴后继地尝试。Chuàngyè de lùshang suīrán jiānnán, niánqīngrén réngrán qiánfùhòujì de chángshì.Although the road of starting a business is hard, young people still keep trying, one after another.