Doubt is useful. It keeps faith a living thing. After all, you cannot know the strength of your faith until it's been tested.

語音講解：
單詞發音
doubt /daʊt/
useful /ˈjuːsfl/
strength /streŋθ/
詞間連讀
It keeps faith a /ɪtkiːpsfeɪθə/
After all /ˈɑːftərɔːl/
strength of your faith until it's /streŋθəvjɔːfeɪθənˈtɪlɪts/

詞匯講解
1. strength n.力量
the strength of... phrase. ...的力量
Organisation is the strength of any good army.
任何優良部隊都是很有組織紀律性的。
2. after all phrase.畢竟 終究 歸根結底
After all, what more can anyone be than themselves?
畢竟，人們除了做自己又能怎樣呢？
He failed after all.他終究是輸了。

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