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Four of the five hottest apps in the U.S. in March were forged in China. Algorithms are often cited as their secret sauce. An often overlooked facet is how cutthroat competition for users at home has given Chinese firms a leg up over Western rivals.

Much like during China’s rise to manufacturing dominance a few decades ago, Chinese tech companies have harnessed a labor pool of affordable talent to constantly fine-tune product features.

生词短语：

forge

锻造

algorithms

算法

facet

方面; (事物的)部分

cutthroat competition

恶性竞争; 残酷的竞争

harness

控制，利用

fine-tune

微调