The paper introduces a manufacturing process of walnut milk and describes imperceptible changes caused by different methods in dealing with the kernel skin of the walnut.

介绍了核桃奶的生产工艺，并描述了加工过程中因通过不同的方法对核桃仁皮衣进行处理而使产品核桃奶的品质有些微妙变化。

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These changes, imperceptible to the human eye, occur as the heart pumps blood through the body.

这些人类眼睛无法知觉的变化发生在心脏将血液泵向全身的时候。

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But even this imperceptible exposure is enough to spark changes in behavior.

但即使是这种无法识别的暴露也足以激起行为的改变。

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After all, loyal fans of blended Scotch whiskies, which are made differently every year but are always supposed to taste exactly the same, often complain often over seemingly imperceptible changes, and even changes in the water used.

FORBES: Whiskey Or Water? Marketing Nightmare As Bourbon Fans Incensed Over Choice

Her skates are chunks of steel as long as 13 feet (the crew changes skate length according to ice conditions), with an almost imperceptible curve along the bottom and a razor-sharp edge so that the skate bites hard into the ice.

FORBES: Shiver Me Timbers