System modeling – Some engineering fields (or specific situations) require the product to be completely designed and modeled before its construction or fabrication starts and, therefore, the design phase must be performed in advance.
系統建模：一些工程領域（或特殊情況）要求產品在其施工或製造開始之前被完全設計和建模，因此，必須提前執行設計階段。