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前缀 mega-
中文含义：百万；兆
Very large, great.
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (10⁶).
Multiplying the unit to which it is attached by 2²⁰ (= 1,048,576, the binary number closest to a million). Computing symbol: Mi.
Multiplying the unit to which it is attached by 2¹⁰ × 10³ (= 1,024,000, the binary round number closest to a million).
词源：Ancient Greek μέγας（great, large, mighty）