求翻译：在野外，袋鼠主要吃各种杂草和灌木；到了动物园里，喂它们的饲料有干草、胡萝卜、蔬菜、苹果、饼干和黑豆，食物种类多，营养也就丰富，在吃食方面也很讲究。美国芝加哥动物园里，曾经发生过一件怪事：那儿有52只大袋鼠，突然在一年之内病死了49只！他们赶紧请专家来“会诊”，动物学家研究了袋鼠的饲料，发现草料中缺少钙和一些矿物质，这正是袋鼠生活中所必需的。于是，他们给袋鼠增加了合矿物质丰富的苜蓿、燕麦和各种蔬菜。没出一个月，剩下的三只大袋鼠就恢复了健康。是什么意思？

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In the wild, eat Kangaroo mainly various weeds and shrubs; and in the zoo's animal feed, and feed them with hay, vegetables, apples, carrots, biscuits and beans, and many types of food, nutrition and foods rich in regard to also put a lot of stress. The Chicago zoo, there had been a strange: There a

In the open country, the kangaroo mainly eats each kind of weed and the bush; To the zoo in, has fed their feed to have the hay, the carrot, the vegetables, the apple, the biscuit and the black soybeans, food type are many, the nutrition is also rich, is eating the aspect very much to be also fastid

In the wild, kangaroos mainly eats various weeds and bushes; to the Zoo, feed them fodder Hay, carrots, vegetables, apples, cookies, and black beans, food variety and nutrition is rich, in terms of food is also very particular about. United States Chicago Zoo has been a remarkable thing: there are 5

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