他一再用白垩粉擦他的球杆尖。

He chalked his billiard cue again and again.

youdao

因此，白垩孵化在春季和小群体中最常见。

Accordingly, chalkbrood is most common in spring and in small colonies.

youdao

而并不是外太空或是白垩纪。

Not exactly outer space then, or the Cretaceous period.

youdao

海底的沙子比白垩更白

Sand on the bottom whiter than chalk

youdao

从地层学上看，它们都属于白垩纪。

From the view of stratigraphy, they all belong to the Cretaceous period.

youdao

我父亲说水泥不能用白垩来制作。

My father said cement couldn't be made from chalk.

youdao

早白垩末是山西组成藏关键时刻。

The key moment of pool-forming was early Cretaceous.

youdao

早白垩世中期—晚白垩世。

Middle stage of Early Cretaceous-Late Cretaceous.

youdao

浅埋藏似能保留具白垩状结构的孔隙。

Study on Strata Mechanical Structure and Support Adaptability of Shallow Seam;

youdao

其侵位时代为早白垩世。

Its emplacement age was Early Cretaceous.

youdao

望着……三角龙：从白垩纪的恐龙(新恐龙收集)。

Looking at... Triceratops: a Dinosaur from the Cretaceous Period New Dinosaur Collection.

youdao

但是很不幸的是，这段迅速的进化过程发生于中白垩纪的一千五百万年间，而这段时期的鲜有化石记录。

"But there were a hundred million years of evolution to play with."

youdao

但是很不幸的是，这段迅速的进化过程发生于中白垩纪的一千五百万年间，而这段时期的鲜有化石记录。

"But there were a hundred million years of evolution to play with."

youdao