-----------------------------------
皮， かわ
1. skin, hide, pelt, fur
2. rind, peel, husk, bark
3. shell, sheath, wrapping
4. mask (hiding one's true nature), seeming
皮
-----------------------------------
一重， 単， ひとえ
1. one layer, single layer
2. monopetalous
3. unlined kimono
4. single-edged eyelid, eyelid with an epicanthic fold, upper eyelid with no fold
tbd
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
