【英语时差8,16】母婴联系B

 Similarly, given the choice between the nest built by their mother and the nest of another mother, normal baby mice always chose the familiar nest while only a third of the receptor-deficient mice chose mom’s nest. The receptor-deficient mice don’t lack in the smelling department. Nor do they cry any less when exposed to dangers such as the presence¹ of a threatening adult male mouse or cold temperatures. It seems that the opioid system is indeed connected to social bonding².

1 presence   

n.出席；到场；存在

参考例句：

• Her presence lent an air of respectability to the occasion.她的到场使那种场合增添了崇高的气氛。
• His presence is indicative of his willingness to help.他的出席表示他愿意帮忙。

2 bonding   

黏结； 连[搭，焊，胶，粘]接，结[耦，焊，接]合，压焊； 砖石砌体砌合

参考例句：

• Set up ultrasonic wire bonding laboratory. 成立超声波电子焊接实验室。
• A purple intemetallic phase (called purple plaque) is commonly found in bonding. 键合中常能发现一种紫色的金属化合物，称为紫斑。