In “因为A，所以B”, both “因为” and“所以” are conjunctive words. “因为” is used at the beginning of the former clause, and “所以” is used at the beginning of the latter one. They indicate “a causal relation” with A as the reason and B the consequence.
因为大熊猫数量少、样子可爱，而且只生长在中国，所以人们说大熊猫是中国的“国宝”。
As pandas are rare, cute, and only exist in China, people say they are the “national treasure” of China.
“而且” is a conjunctive word used to indicate “moreover”. It’s often used to connect adjectives, verbs and clauses, etc.
因为大熊猫数量少、非常可爱，而且只生长在中国，所以人们说大熊猫是“国宝”。
As pandas are rare, cute, and only exists in China, people say they are the “national treasure” of China.
Big pandas are few in number. There are only about a thousand
in the world. Big pandas look cute. Their bodies are black and
white in colour, round and fat, especially their black eyes and
their round heads are very interesting. They can climb trees.
Their action is very slow.
因为大熊猫数量少、样子可爱，而且只生长在中国，所以人们说大熊猫是中
国的“国宝
Because they are few in number, they are lovely and are only
found in China. So people say big pandas are China’s national
treasure.
In order to be friendly to other countries, from 1957 to 1982,
China has given a total of 23 big pandas to 9 countries. Now,
China’s big pandas can be found in USA, Germany, Japan and
other countries .
你见过大熊猫吗？你喜欢大熊猫吗？
Have you ever seen a big panda? Do you like big pandas?
大熊猫的数量非常少，现在全世界只有一千多只。大熊猫的样子很可爱。
它们的身体是黑色和白色的，又圆又胖，特别是它们的黑眼圈和圆脑袋很有趣。
大熊猫喜欢吃竹子，会爬树。它们的动作很慢。
Big pandas are few in number. There are only about a thousand
in the world. Big pandas look cute. Their bodies are black and
white in colour, round and fat, especially their black eyes and
their round heads are very interesting. They can climb trees.
Their action is very slow.
因为大熊猫数量少、样子可爱，而且只生长在中国，所以人们说大熊猫是中
国的“国宝
Because they are few in number, they are lovely and are only
found in China. So people say big pandas are China’s national
treasure.
为了向外国朋友表示友好，从1957年到1982年，中国一共送给9个国家
23只大熊猫。 现在，在美国、德国、日本等国家都有中国的大熊猫。
In order to be friendly to other countries, from 1957 to 1982,
China has given a total of 23 big pandas to 9 countries. Now,
China’s big pandas can be found in USA, Germany, Japan and
other countries .
Hi Cheng WenKuan,
Thanks for you translation.