what does "drilled into "mean？
The Parkland employees least in touch with reality were the clerks. The importance of paperwork had been drilled into them, and now, seeking a haven from the general disarray, they fell upon the familiar rituals of routine.

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Answer

It means someone has taught something to them over and over until it became automatic. Children learn addition and multiplication facts by doing "drills," where they do many problems quickly. They have "fire drills" in school where they practice exiting a building as quickly and orderly as possible to be prepared for fire. These things and others are "drilled into them."

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!