booster seat

booster-seat的词性：
n.（名词）

1. A car seat for small children that lifts the child by several inches, designed for use with an adult seat belt.
辅助车座椅：小轿车上供小孩坐的几英寸大小的座椅，和成人座椅带一起用

2. A seat placed on top of the seat of a chair, used to elevate a small child at a table.
辅助餐座椅：放在椅子上边的小座椅，用于举起面对桌子的小孩