海牛的行為動(dòng)作: swim,roll,do somersaults,migrate,breathepush, sleep, rest, float 海牛進(jìn)食的動(dòng)作: nibble,graze, munch,eat, grind,drink,swallow 海牛的外貌特征: gray,wrinkled,mighty,big,heavy,large 海牛的身體結(jié)構(gòu): whisker, skin, tail, eye,nostril,flipper, lip,molar 與海牛的生活習(xí)性有關(guān)的詞: mammal,super swimmer,shallowwater, ocean, river, warm water, herbivore, near the surface be similar to...與......相似 teach sb.how to do sth.教某人怎樣做某事 take a breath 吸氣 on one'sown 靠自己的力量，獨(dú)自地 atatime每次 定語(yǔ)從句: Manatees are mammals that live in the water. 比較狀語(yǔ)從句: That's as long as two kids'bikes lined up endtoend. 被動(dòng)語(yǔ)態(tài):Amanatee baby is called a calf 動(dòng)名詞短語(yǔ)作主語(yǔ): Swallowing trash can hurt manatees 結(jié)果狀語(yǔ)從句: Fishing line can get tangled around manatees sothey can't swim.
