外的英語翻譯：

besides; in addition; not closely related; other; outer; outside; unofficial
【醫(yī)】 ec-; ecto-; exo-; extra-; xeno-

層的英語翻譯：

layer; region; stage; story; stratum; tier
【計】 layer
【醫(yī)】 coat; lamella; lamellae; lamina; laminae; layer; strata; stratum

循環(huán)的英語翻譯：

cycle; recur; circle; rotate; circulation; repetition; revolution
【計】 DO-loop; for-loop; loop; unwinding
【化】 recirculate
【醫(yī)】 circuIation; cycle
【經(jīng)】 cycle; revolving; rotation