He has one pair of glasses on the top of his head. And another pair on a piece of cord around his neck.
一副眼镜支在他的脑门上，还有一副用绳子挂在他的脖子上。
2
The Dielectric Strength Test is to be performed between each pair of conductors (including ground if applicable) and between each conductor and the foil wrapped cord guard.
电介质强度试验是在每对导体（包括地）之间和每个导体与包装了金属薄片的尾档之间测量。
3
The ventral nerve cord of the crab in the embryo included 1 pair mandibular neuromere, 2 pairs neuromeres of maxillae, 2 pairs neuromeres of maxillipede and abdomen nerve cord.