emerald
音标：
/'em(ə)r(ə)ld/
英英释义：
①An emerald is a precious stone which is clear and bright green.【n.翡翠;绿宝石】
②Something that is emerald is bright green in colour.【n.翠绿色;翡翠色】
例句：
①Flaws in emeralds greatly reduce their value.
祖母绿上的瑕疵大大降低了其价值。
②Her bracelet was set with emeralds .
她的手镯上镶着绿宝石。
Matt Haig的新书 The Midnight Library 也出现了这个表达：
这里再拓展一下，红宝石可以说“ruby” /'ruːbɪ/
蓝宝石可以说“sapphire” /'sæfaɪə/
speak for itself不言而喻，不言自明
英文释义：
If something speaks for itself, it is clearly so good or effective that no additional argument about it is necessary.
例句：
His success as a lawyer speaks for itself .
《经济学人》一篇题为 To feed the world 的文章也出现了这个表达：
