Idea: If your failing expression is thought to lawfully check with a thing that's in some cases null or missing, possibly specify a default price like myOptionalVar!师傅进门会穿鞋套，工作台面会铺上厚厚的塑料膜。临走收拾的干干净净。油烟机也擦的锃亮！太平洋抽油煙機使用高品質不鏽鋼結合簡約�