Like the calcium phosphate stones, struvite stones are dirty white and radiopaque under an X-ray.

同结石样，鸟粪石是灰白色的，在X线片上是不透光的。

I took Merrick to the country in a train with dark windows, so nobody could see him.

带着麦里克乘列窗户不透光的火车来到乡下，没有人看见们。

A tiny minority of stones are cystine stones, composed of the amino acid cystine which sometimes leaks into the urine to crystalize and form a yellow or light pink colored stone that is radiopaque under X-ray.

有部分结石是胱氨结石，是胱氨渗入尿液后结晶形成黄色或者淡粉色的结石，在X线下是不透光的。