深沟坚垒 | strong and well-prepared defenses

shēn深gōu沟jiān坚lěi垒

Strong and well-prepared defenses; deep ditches and high ramparts.

为了保障研究成果的安全，科学家们为实验室设置了深沟坚垒般的保护措施。

To ensure the safety of research findings, scientists established deep ditch and strong rampart-like protective measures for the laboratory.

Era:

Early Modern

Frequency:

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