郭浩说，在牛奶中添加三聚氰胺化工原料的做法在业内早已有之。

The practice of adding the industrial chemical melamine to milk 'has existed for a long time in this industry.

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在九楼郭培炎的实验室里，有三套设备准备扫描奥克兰送来的DNA样本。

At Dr. Kwok’s ninth-floor lab, three sets of robots prepare the DNA samples shipped from Oakland.

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郭说：“故宫有三个主厅已经禁止旅客进入，因为金子制成的地砖太脆弱而不能让人踩上去。”

Guo said, "Three main halls of the Imperial Palace are no longer allowing visitors to enter, because the floor tile made of gold is too fragile to be stepped on."

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