Feedback is like gold dust when you're learning a language.

学习语言时，反馈就像金粉一样。

For instance, there's a species of marmot in the Himalayas that spreads gold dust while digging.

例如，在喜马拉雅山上，有一种土拨鼠在挖洞时会扬起金粉。

Day after day, children stand in muddy creeks and rivers scouring the water for specks of gold dust.

孩子们日复一日站在泥泞的小溪及河流中冲刷着着金粉的斑点。

So saying, he slammed a sack of gold dust of the size of a bologna sausage down upon the bar.

说着，他把一袋香肠大小的金沙甩在柜台上。

But this is gold dust to me.

但这对我来说是金粉。

The seed is as expensive as gold dust and as fine.

种子贵如金粉， 又好又细。

A textbook in astrophysics is like gold dust.

天体物理学教科书就像金粉。

It is usually obtained in the form of small grains called gold dust, but sometimes also in that of lumps called nuggets.

它通常以被称为“金粉”的小谷粒的形式获得，但有时也可以以“金块”的块状形式获取。

I helped her up and we dusted bits of tinsel, gold dust, and loose spangles off her dress.

我扶她起来，我们从她的裙子上掸去金属丝、金粉和散落的亮片。

It was no longer bobbed, and it had changed in the last year from a rich gold dusted with red to an unresplendent light brown.

它不再有波波头， 并且在去年已经从撒上红色的浓郁金色变成了不起眼的浅棕色。