The roots of both please and placebo are the same and the American Heritage Dictionary takes them back to an Indo-European root plak that meant "to be flat."
单词please和placebo有同一个词根，《美国传统英语词典(american Heritage Dictionary)》为它们追根溯源到了一个印欧语系的词根plak，意指“处于平的状态”。
The roots of both please and placebo are the same and the American Heritage Dictionary takes them back to an Indo-European root plak that meant "to be flat."
单词please和placebo有同一个词根，《美国传统英语词典(american Heritage Dictionary)》为它们追根溯源到了一个印欧语系的词根plak，意指“处于平的状态”。
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