n.

1. 联系；纽带
2. 【数】线括（号）
3. 【解】系带

n.

1. Anatomy  a connecting band of tissue, such as that attaching a flexor tendon to the bone of a finger or toe.
2. Mathematics  a horizontal line drawn over a group of terms in a mathematical expression to indicate that they are to be operated on as a single entity by the preceding or following operator.