החיפוש שביצעת - chemical engineering data processing ((using state) or (((using stirred) or (using stem)))). - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
chemical engineering » electrical engineering, biomedical engineering
using stirred » using stereo, using shared
using state » using static, using stable
stem » item, step

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