HSK 1.0 (1992)	Big5	Gb	Pin	Eng
A	外	外	wai4	outer/ outside/ external/ foreign
C	外部	外部	wai4bu4	external-part/ outside/ exterior/ surface
C	外界	外界	wai4jie4	external-world/ outside
C	外科	外科	wai4ke1	external-department/ surgical department
C	外祖父	外祖父	wai4zu3fu4	external-grandfather/ maternal grandfather
C	外祖母	外祖母	wai4zu3mu3	external-grandmother/ maternal grandmother

HSK 2.0 (2010)	Big5	Gb	Pin	Eng
2		外	wai4	outside/ in addition/ foreign/ external
6		外表	wai4 biao3	external/ outside/ outward appearance
6		外界	wai4 jie4	the outside world/ external

HSK 3.0 (2022)	Big5	Gb	Pin	Eng
1	外	外	wài	outside, in addition, foreign, external
5	外界	外界	wàijiè	external world, external/outside world, the outside world, outside, environment, outside world, externality, external, the external world
6	對外	对外	duìwài	external, foreign, pertaining to external or foreign (affairs)
6	外部	外部	wàibù	outer, surface, external, outwall, outside, exterior
6	外觀	外观	wàiguān	shell, outward appearance, show, externality, visual aspect, exterior, effect, superficies, look, likeness, appearance, facade, surface, presentment, apparel, impression, facies, aspect, complexion, resemblance, semblance, guise, frontage, outwardness, rind, garb, showing, face, veneer, outside, garment, getup
6	外來	外来	wàilái	foreign, adventive, externally, incoming, external, outside, exotic
7	外表	外表	wàibiǎo	shell, outward appearance, outwall, mess, presentation, resemblance, externality, semblance, guise, visual aspect, outwardness, exterior, rind, showing, look, superficies, likeness, mien, appearance, vizard, surface, garment, external, getup
7	外形	外形	wàixíng	figure, shape, external form, contour
7	外援	外援	wàiyuán	external help, foreign aid

它们的外表有什么差别？ How does their external appearance differ ? 它们 的 外表 有 什么 差别 ？ (ENG ) (ZH ) (0631)