lest
conj. /lest/ B2
唯恐；免得
In order to prevent any risk that something might happen.
仙境例句
She nibbled the mushroom slowly, lest she grow too tall for the wood.
她一小口一小口地啃蘑菇，免得自己长得比树林还高。
原著这一句
She went in without knocking, and hurried upstairs, in great fear lest she should meet the real Mary Ann, and be turned out of the house before she had found the fan and gloves.
她没敲门就走了进去，急忙跑上楼，生怕撞见真正的玛丽·安，在找到扇子和手套之前就被赶出门去。
卡罗尔原著 · 第 4 章