http://www.english-test.net/toeic/

http://www.english-test.net/toeic/meanings/001/toeic-test.php

劍橋字典 

https://dictionary.cambridge.org/zht/%E8%A9%9E%E5%85%B8/%E8%8B%B1%E8%AA%9E-%E6%BC%A2%E8%AA%9E-%E7%B9%81%E9%AB%94/sound

Google 翻譯 

https://translate.google.com/?hl=zh-TW

同意字用法比較 

https://wikidiff.com/familiar/conversant