We do a bird count twice a year to study the changes in bird numbers.
我们每年数两次鸟儿，以研究鸟儿在数量方面的变化；
We like birdwatching, We do a bird count twice a year to study the changes in bird numbers. We are now inviting students to.
我们喜欢观鸟，我们每年数两次鸟儿，以研究鸟儿在数量方面的变化。
By 1900, there were 27 bird lovers who decided to count birds instead of killing birds.
到了1900年，有27名鸟类爱好者决定改用数鸟来代替对鸟类的捕杀。
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