请问一下。We must find ways to protect our environment.If we fail to do so,we'll live to regret it.中(1)so是什么意思呢?为什么不用do it呢?(2)最后的live to regret it可以帮忙解释吗?谢谢了!
Interaction with the multitude of microscopic organisms a baby picks up when it is born helps that system to learn friend from foe.老师您好,请问这里的a baby应该是省略了关系副词where吧,它为何又可以省略。它并非表地点,原因,时间啥的。
For instance, Indians in Canada's
Northwest Territories
typically have at least 13 terms for different types and conditions of snow,
and most non-skiing native Southern Californian use only 2 terms.这个句子答案将and改成了while表示对比,请问老师,我是否可以把and改为but?