求翻译：对于单件重量超过20吨(水运30吨)或外形尺寸(长×宽×高)超过10m×3m×3m中任何一项大件货物，乙方在设备交付前三十天将外形尺寸草图(标明外形尺寸、重量、重心、吊装着力点和注意事项)一式四份邮寄甲方收货单位。是什么意思？

For single-piece weight exceeding 20 tons (30 tons water) or Dimension (L × W × H) more than 10m × 3m × 3m in any of the big-ticket goods, B in the thirty days before delivery of the equipment will sketch dimensions ( indicating dimensions, weight, center of gravity, lifting the focus and attention)

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For a single weight of more than 20 tonnes (shipping 30 tons) or overall dimensions (l x w x h) than any 10mx3mx3m a large goods, b 30 days before the device delivered dimensions sketches (indicate the dimensions, weight, Center of gravity, hoisting points and considerations) a four copies mailed pa

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