idiom > Trench Solid base
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深沟固垒
Pinyin: shēn gōu gù lěi

Explanation: 犹深沟高垒。

No. 2
  Still Shengougaolei. Deep trenches and high camp. That a strong defense.
Translated by Google
No. 3
  Still Shengougaolei. "Hua Yue" fourth two back: "South Jiangbei area government troops, was able to ditch solid base, keep a winter lying." See "Shengougaolei."
Translated by Google