Unable to continue or sustain; hard to keep up.
难于继续下去。
《礼记·檀弓上》孔子曰‘哀则哀矣，而难为继也。’”
With such low funding, the project is hard to sustain.
Learn the next connected idiom: 难以为继 (nán yǐ wéi jì) → 继往开来 (jì wǎng kāi lái)
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