Take a very small paintbrush or pencil and a light, nearly white colour.
拿一个非常小的画笔或铅笔，和一种接近于白的浅色。
Take a very small paintbrush or pencil and a light, nearly white colour .
用一个很小的笔刷或铅笔，选择一种亮的接近于白的颜色。
Using a small paintbrush dipped in the bacteria, they are painstakingly 'painted' onto the tiny canvas - a petri dish only a few centimetres wide.
他们使用的“画布”很小——只有几厘米直径的圆形培养皿，所以就只能使用很小的“画笔”来蘸取少量细菌，然后涂布在培养基上。
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