English Dictionary

shale

/ʃeɪl/

noun

A shell or husk; a cod or pod. / (geology) A fine-grained sedimentary rock of a thin, laminated, and often friable, structure.

The shale crumbled in my hands.

意味（1）

A shell or husk; a cod or pod.

the green shales of a bean

意味（2）

(geology) A fine-grained sedimentary rock of a thin, laminated, and often friable, structure.

As on all large green roofs, the soil is not dirt exactly but a gravel-like growing medium of granulated pumice, shales, clays and other minerals.