Randomly exposed them to eight designs of winged needles, such as one decorated as a butterfly, and six designs of syringes fitted with a needle.
Randomly exposed them to eight designs of winged needles, such as one decorated as a butterfly, and six designs of syringes fitted with a needle.
让他们随机看到8款带翼的针，那样的装饰的有如一只蝴蝶，以及6款的合上了一支针的针筒。