是的，这是美国法律的灰区，“周说。”

So yes, it is a gray area in U. s. law, "Zhou says."

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虽然其巨大的火山灰柱并非空前绝后，但其位置尤其引人注目，因为它漂浮到了许多人口稠密区。

Although the large ash plume was not unparalleled in its abundance, its location was particularly noticeable because it drifted across such well populated areas.

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他从1990年到1994年在西太区作为根除脊髓灰质炎行动领导人，使该区域报告的脊灰病例从5,963例减少到700例。

As head of polio eradication initiatives in the Western Pacific from 1990 to 1994, he oversaw a reduction in reported polio cases from 5963 to 700 in the Region.

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