1. 包在囊内：encyclopedize 排列 | encyst 包在囊内 | end for end 位置颠倒
2. 包囊：encrustation; encrustment 结壳;形成皮膜 | encyst 包囊 | encystment 被囊形成
3. 被囊：被层 ectophragm | 被囊 encyst | 脱囊 excyst
4. 被包在囊内：encyst 把...包在囊内 | encyst 被包在囊内 | end-all 最终目标
1. Six months for the projectile to encyst before the knees can be opened safely.
有六个月时间让弹片结成胞囊，在膝头上动手术才能安全。