peripheral
adj
1 ~ (to sth) of secondary or minor importance (to sth) 次要的; 不重要的
topics peripheral to the main theme 围绕中心议题的小题目.
2 of or on a periphery 外围的; 边缘的
peripheral zones 边缘地带.
Do you remember one afternoon ten years ago when I came to your house and borrowed a necklace of yours? Pierre, my husband, was working in a government office. We'd been invited to a ball at the palace so I needed to borrow some jewellery.