请根据以下信息，用英语写一份关于北京植物园的简介。

　　北京植物园（beijing botanical garden）座落于北京西山脚下，是我国北方最大的植物园。它建于1956年，占地900亩左右。目前北京植物园有6000多种植物，其中包括一些稀有、濒危物种和外来物种。每年大约1，400，000游客参观，游客在欣赏美景的同时，丰富了植物学知识。

　　注意：1. 词数：100左右；   2. 可适当增加细节，以使行文连贯。

　　one possible version：

　　beijing botanical garden， which lies at the foot of the west hill of beijing， is presently the largest botanical garden in north china. it was built in 1956 and now it covers about 900 mu. in beijing botanical garden there are more than 6，000 species of plants， including many exotic plants and some rare and endangered species. beijing botanical garden is so beautiful that it attracts more than 1.4 million visitors every year. not only can the visitors enjoy the beautiful scenery， but also they can learn a lot about botany in it.