Learning to apologize in another language does not excuse speakers from practicing the same good manners in their mother tongue.
学习用另一种语言表达歉意跟使用母语一样，应注意我们的礼貌。
At the later stage, when the "window of opportunity" is passed, the child may face difficulties in learning languages other than his mother tongue.
之后，这个“绝佳时期”过去后，儿童再学习其母语之外的语言，就会相对困难很多。
In English learning, the influence of Chinese, the mother tongue, is significant.
在英语学习中，汉语母语的影响非同小可。
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