通过这一数字，我们可以看看太阳能活多长时间。
这次爆炸将大约100万亿吨的尘埃提升到大气中，这一数字可以通过测量这些尘埃降落到地表时所形成的沉积层的厚度来确定。
The explosion lifted about 100 trillion tons of dust into the atmosphere, as can be determined by measuring the thickness of the sediment layer formed when this dust settled to the surface.
到2006年，这一数字已显著减少，只有100多名婴儿是通过母婴传播感染的(根据33个州的报告得出的数据)。
10 By 2006, this number had dramatically decreased and just over 100 babies were infected through MTCT (in the 33 states that reported data).11.
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