Some sea urchins海胆 have venomous (toxin) spines
A、sensuous(feeling)C
暂无解析
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
The first paper was made from the bark of the mulberry tree.
Mary McCarthy s satires 讽刺文学 are couched in a prose style that has a classic precision.
Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
