短吻鳄和鳄鱼的生活环境: warm area,pond,lake,marsh,wetlandriver, swamp 短吻鳄和鳄鱼的身体结构: jaw,tooth,snout,ear,nostril,eye,eyelidlung, tail, foot, body, skin 短吻鳄和鳄鱼的行为动作:swim,float, see,smell,hear,feel, eat,shoot, grab, gulp, roar, attack 短吻鳄和鳄鱼的食物: fish,insect, bird,frog,snake,mammal,antelope, buffalo belong to... 属于...... watch out 小心 wait for... 等待...... stick around 不走开;待在原地 gulp down... 大口吞咽·..... 让步状语从句: Though alligators and crocodiles are different, theyare both reptiles. 过去分词短语作后置定语:Alligators and crocodiles belong to agroup of reptiles called crocodilians. 比较状语从句: They see much better in the dark than we do. 定语从句: Crocodilians are carnivores, which means they eatmeat. 被动语态: Then laws were made to protect them.