Thirty twosomes, or 60 participants, took part in the experiment and ranged in age from 18 to 54.

60个参与实验者，共30对，年龄从18岁至54岁。

youdao

Thirty twosomes, or 60 participants, took part in the experiment and ranged in age from 18 to 54.

60个参与实验者，共30对，年龄从18岁至54岁。

youdao