Invest in downloadable bird songs or CDs so you can learn which birds you hear, but avoid playing those songs in the field when they might distract or confuse birds.
下载一些鸟鸣的录音或买一些CD，这样你就可以知道你听到的是哪种鸟了，但是不要在野外放这些录音，因为这样会误导鸟儿或让它们感到迷惑。
I'll therefore concentrate on the differences that are likely to confuse you when you start working with BCEL.
因此我将主要介绍在开始使用BCEL时，可能会让您感到迷惑的那些不同之处。
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