Introduce and discharge the principle, structure and characteristic of the lightning rod ahead of time.
介绍了提前放电避雷针的原理、构造及其特点。
His spear shaft was like a weaver's rod, and its iron point weighed six hundred shekels. His shield bearer went ahead of him.
7枪杆粗如织布的机轴、铁枪头重六百舍客勒。有一个拿盾牌的人在他前面走。
His spear shaft was like a weaver's rod, and its iron point weighed six hundred shekels. His shield bearer went ahead of him.
7枪杆粗如织布的机轴、铁枪头重六百舍客勒。有一个拿盾牌的人在他前面走。
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