In a fair test of a medicine or an idea, you do not want hope or fear to change the result. In a double-blind study, two groups are compared, and neither the people in the study nor the scientists running it know who is in which group.

In a fair test在一場公平的測試裡 of a medicine or an idea——測一種藥或一個想法—— you你 do not want不會想讓 hope or fear希望或恐懼 change the result改變結果。 In a double-blind study在 double-blind（雙盲）研究裡， two groups兩組人 are compared被拿來比較， and neither而 the people in the study研究裡的受試者 nor the scientists running it和主持研究的科學家 know都不知道 who is in which group誰在哪一組。

One group may get the real treatment; the other may get a pill with no medicine in it, or a different treatment. That information is locked away until the end. “Blind” here does not mean unable to see with your eyes; it means “not told which group is which”.

One group一組 may get可能拿到 the real treatment真的治療； the other另一組 may get可能拿到 a pill with no medicine in it一顆裡面沒有藥的藥丸， or a different treatment或另一種治療。 That information那個資訊 is locked away被鎖起來 until the end直到最後。 "Blind" here這裡的 "blind" does not mean不是指 unable to see with your eyes眼睛看不見； it means它是指 "not told which group is which"「沒被告知哪組是哪組」。

There is also single-blind, where only the people being studied are kept in the dark, and the researchers know. Double-blind is the stricter kind, and people trust it more, especially for new medicines.

There is also還有一種 single-blind single-blind（單盲）， where only在那裡只有 the people being studied被研究的人 are kept in the dark被蒙在鼓裡， and the researchers know而研究者知道。 Double-blind Double-blind is是 the stricter kind比較嚴格的那種， and people trust it more大家也比較信任它， especially for new medicines尤其是對新藥。

You will hear it in science news and hospital research. It is a specialist word, but newspapers often use it without stopping to explain.

You你 in science news and hospital research會在科學新聞和醫院研究裡 will hear it聽到它。 It它 is是 a specialist word專業詞， but但 newspapers報紙 often常常 use it用它 without stopping to explain而不停下來解釋。