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

同磷酸钙结石一样，鸟粪石是灰白色，在X线片上是。

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

带着麦里克乘一列火车来到乡下，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.

有一小部分结石是胱氨酸结石，是胱氨酸渗入尿液后结晶形成黄色或者淡粉色结石，在X线下是。