learningbyusing是什么意思呢？

you can learn english only by using it你只能通過使用英語來學英語雙語對照例句:

1.Only by speaking english, can you learn to speak it. 只有通過說英語，才能學會說英語。

2.So you can only learn to speak english by speaking. 所以，你只能在講英語中學怎么說英語