The most severe pandemic of the past century occurred in 1918, when up to 50 million people died, and was caused by the H1N1 flu strain.
上世纪最严重的一次大流行发生在1918年，造成了近5000万人的死亡，其病源为H1N1型流感病毒。
In late 2008, Ireland recalled many tons of pork meat and pork products when up to 200 times more dioxins than the safe limit were detected in samples of pork.
2008年末，爱尔兰因在猪肉抽样检查中检测出二恶英含量超出安全指标的200倍，召回大量猪肉和猪肉产品。
I don't know why it's facing down when up is where I'm going.
我不知道为什么当我要向上走的时候，它却面朝下。
When up to a certain dose, it can induce apoptosis.
在一定剂量下还可诱发其凋亡。
When up to a certain dose, it can induce apoptosis.
在一定剂量下还可诱发其凋亡。
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