Today's Sentence
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Along with barbed wire fences, the Germans had sunk microphones nine feet deep into the soil all along the perimeter in order to detect the sound of digging.
Original Video：
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Key Vocabulary
1. barbed wire fence
barbed wire fence
(n.)
2. sink
sink
[sɪŋk] (v.)
3. foot
foot
[fʊt] (n.)
4. soil
soil
[sɔɪl] (n.)
5. in order to
in order to
(phr.)
6. detect
detect
[dɪˈtɛkt] (v.)
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