Some sea urchins海胆 have venomous (toxin) spines
C
暂无解析
Alligatorsstillexistinsomeofthedank潮湿swampsandbayous小海湾ofAlabama'scoastalregions.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.