All three cell types formed in the bone marrow which is the soft tissue inside your bones.

所有这三种细胞类型都是在骨髓中形成的，骨髓是骨骼内的软组织。

Peat is a type of soil formed over thousands of years that is exceptionally rich in carbon.

泥炭是一种经过数千年形成的土壤，含有极其丰富的碳。

This climate type forms the heartlands of three countries – Russia, the United States and Canada, which together make up over half of all global area for this climate.

这种气候类型形成了俄罗斯、美国和加拿大三个国家的心脏地带，这三个国家的面积加起来占全球这种气候面积的一半以上。