thin down

The heating action of longer wavelengths light results in silk fiber dryness, thin down and character decline.

长波长光主要是加热的作用使丝纤维干燥、变细，丝质发生变化；而短波长光的作用，主要是对丝纤维表面造成损害，而加热效应较小。

Perhaps there is wide space in a tree between one thin branch and the next, so walking is not a good choice, while on each small branch there is enough room to set both feet down side by side, so hopping seems to make sense.

在一棵树上,一根细树枝和另一根细树枝之间可能相隔很宽,所以走不是一个好的选择。但是，每一根小树枝上都有足够的空间让双脚并排站立,所以似乎应该跳跃。

Boil down the soup until it gets thicker. I don't like thin soup.

把汤熬浓, 我不喜欢稀汤.

Thin down your mayonnaise with soured cream or natural yoghurt.

用酸奶油或原味酸奶稀释蛋黄酱。

Investigation on Heat and Mass Transfer and Flow Stability of a Thin Liquid Film Draining Down a Wall

壁面薄膜流的热质传递和稳定性研究