Kēyán rényuán pījīngzhǎnjí, gōngkè le yīgè yòu yīgè nántí.
The researchers broke through obstacle after obstacle, cracking one hard problem after another.
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From 《后汉书·冯异传》: the Han emperor Guangwu tells his general Feng Yi, '为吾披荆棘,定关中' — 'you cleared the thorns and brambles for me, settling the Guanzhong region.' Originally praise for trailblazing military effort.