Merriam Webster's Vocabulary Builder.
每段音频包含四块内容：单词、释义（一个或多个）、例句（一句）、拓展等。
如
amicable: friendly, peaceful （释义）
Their relations with their in-laws were generally amicable, despite some bickering during the holidays. (例句）
Amicable often describes relati ons between two groups, or especially two nations- for example, the United states and Canada, which are proud of sharing the longest unguarded boarder in the world. So we often speak of an amicable meeting or an ... （拓展）
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