Someseaurchins海胆havevenomous(toxin)spines
A、sensuous(feeling)Blue－greenalgaegrowabundantlyinsaltmarshes.
HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?
The first important exposition in the United States was held in Philadelphia in 1876.
Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.
All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
