A heavy burden and a long journey
To have great responsibility for a long period of time
Positive
因此，美军从该国的最终撤离，将任重道远 | Yīncǐ, měijūn cóng gāi guó de zuìzhōng chèlí, jiāng rènzhòngdàoyuǎn
Therefore, American troops' withdrawal from that country will be a long and difficult task
[Source]
艾滋病防治依然任重道远 | Àizībìng fángzhì yīrán rènzhòngdàoyuǎn
There's still a long way to go until there's a cure for AIDS
[Source]
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This is an HSK chengyu
《论语》(Lún Yǔ), or the Analects of Confucius
This chengyu comes from a line in the work listed in the "Origin" section above