千的五次方,百万的四次方;
词源记忆法
quadr-,四,-illion,百万,缩写自million此处为million乘以三次1000.比较billion,trillion
The human eye is sensitive to light frequencies that range from a few hundred trillion to several hundred quadrillion periods per second.
人眼对光频率的敏感范围从每秒几百万亿次到数百万亿亿次。
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