美国科学家日前表示，新的电脑模型显示，下一个太阳活动周期将比先前一个太阳活动周期更加活跃，它所引发的磁暴对地球上通讯系统的破坏也将更大。
A new computer model suggests the next solar cycle will be more active than the previous one, potentially spawning magnetic storms that will be more disruptive to communication systems on Earth.
华盛顿路透通讯社——在周一美国科学家报道：一半的美国人有各种视力问题，其中主要的是近视和散光。
WASHINGTON (Reuters) - Half of all Americans have some sort of vision problem, most of them myopia or astigmatism, U. s. Researchers reported on Monday.
华盛顿路透通讯社——在周一美国科学家报道：一半的美国人有各种视力问题，其中主要的是近视和散光。
WASHINGTON (Reuters) - Half of all Americans have some sort of vision problem, most of them myopia or astigmatism, U. s. Researchers reported on Monday.
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