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

语音讲解：
单词发音
doubt /daʊt/
useful /ˈjuːsfl/
strength /streŋθ/
词间连读
It keeps faith a /ɪtkiːpsfeɪθə/
After all /ˈɑːftərɔːl/
strength of your faith until it's /streŋθəvjɔːfeɪθənˈtɪlɪts/

词汇讲解
1. strength n.力量
the strength of... phrase. ...的力量
Organisation is the strength of any good army.
任何优良部队都是很有组织纪律性的。
2. after all phrase.毕竟 终究 归根结底
After all, what more can anyone be than themselves?
毕竟，人们除了做自己又能怎样呢？
He failed after all.他终究是输了。

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