Dolphins
海
豚 hǎi tún
Dolphins 海
豚 hǎi tún are
cetaceans. They are aquatic mammals
哺
乳动物 bǔ rǔ dòng wù.
Dolphins 海
豚 hǎi tún have
streamlined bodies which allow them to swim more efficiently in
the water. Streamlines bodies reduce drag* (water resistance when
swimming).
The two front fins of a dolphin 海豚 hǎi tún are also known as paddles. Like the shark 鲨鱼 shā yú, a dolphin 海 豚 hǎi tún also has a dorsal fin 背鳍 bèi qí on its back. To move forward, a dolphin 海 豚 hǎi tún sweeps its horizontal tail up and down. This is unlike a fish that moves its tail from side to side.
Dolphins 海 豚 hǎi tún are not only found in the seas and oceans 海洋 hǎi yáng. There are also river dolphins that dwell in the Amazon River 亚马逊河 yà mǎ xùn hé and the Yangtze River 长江 cháng jiāng.
* see also types of forces
The two front fins of a dolphin 海豚 hǎi tún are also known as paddles. Like the shark 鲨鱼 shā yú, a dolphin 海 豚 hǎi tún also has a dorsal fin 背鳍 bèi qí on its back. To move forward, a dolphin 海 豚 hǎi tún sweeps its horizontal tail up and down. This is unlike a fish that moves its tail from side to side.
Dolphins 海 豚 hǎi tún are not only found in the seas and oceans 海洋 hǎi yáng. There are also river dolphins that dwell in the Amazon River 亚马逊河 yà mǎ xùn hé and the Yangtze River 长江 cháng jiāng.
* see also types of forces
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Lumba-lumba
海豚 hǎi tún
Pasangan sirip depan lumba-lumba juga dikenali sebagai dayung. Lumba-lumba juga mempunyai sirip dorsal 背 鳍 bèi qí seperti ikan yu 鲨鱼 shā yú. Untuk bergerak ke hadapan, lumba-lumba mengayunkan ekornya (yang berbentuk mendatar) ke atas dan ke bawah. Ini berbeza dengan ikan yang menyapu ekor menegaknya sebelah ke tepi.
Lumba-lumba bukan hanya hidup di dalam laut dan lautan 海 洋 hǎi yáng. Terdapat juga lumba-lumba sungai yang hidup di dalam Sungai Amazon 亚 马逊河 yà mǎ xùn hé dan Sungai Yangtze 长江 cháng jiāng .
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