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Milc is expensive and may keep production artificially high .

milc费用高而且可能使乳产品价格人为的居高不下。

Stimulants like caffeine and cigarettes create the physical sense of anxiety artificially by constricting blood vessels and raising the heart beat .

类似咖啡因或是香烟这样的刺激物可以通过收缩血管和让心跳加速来人为地在身体上制造出紧张感。

Isoprene can also be artificially polymerised to make synthetic rubber .

异戊二烯也可以通过人工聚合来制造合成橡胶。

But these numbers are artificially low .

但这些数字是人为调低的。

That link has artificially depressed the prices of german exports .

这种机制人为压低了德国出口商品的价格。