Ftn
abbr. fortification 防御工事，要塞，筑城术
🗣️ 情景例句
to keep working on my fashion designs.
继续我的服装设计工作。
He's studying his lesson.
他正在学习课程。
was susceptible to a fatal virus disease, myxomatosis.
易患一种叫做"多发性粘液瘤的致命病毒性疾病。