用手指沾面粉戳入面团当中，面团将会随之凹陷下去，但是不会立即弹起或继续向下陷，这就表示头次发酵完成。

Coat your finger with flour and press your finger into middle of the dough, the indentation should remain visible for a few seconds.

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生物学家第一次在野外观察到了大猩猩利用简单的工具完成原始的任务，例如用一根棍子戳入沼泽水塘以试探其深度。

For the first time, biologists have documented the gorillas in the wild, using simple tools to perform rudimentary tasks such as poking a stick in a swampy pool of water to check its depth.

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