Gingival crevice
[医] 龈缝, 龈下隙
🧩 词语组成解析
a. 齿龈的\\n[医] 龈的
🗣️ 情景例句
Do you know anything about South American culture?
你了解南美洲的文化吗？
He gave her his word that he would never be late again.
他向她保证，绝不再迟到。
Then knowledge began to be accumulated according to a systematic plan.
于是，知识便开始有系统有计划地积累起来。