half-life

常见例句

用作名詞 (n.)

• The time it takes for half of its original amount to decay is called the half-life.
  衰變至衹賸下原來數目一半所需的時間稱爲該核素的半衰期。
• It is not necessary to wait until half of a sample has decayed in order to measure the halflife.
  不必一直等到樣品衰變一半之後才測量它的半衰期。
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