Which part of you don't understand the engineer T-Shirt

Applicable Scene:shopping, Hign-concerned Chemical:None, Sleeve Length(cm):short（4-16inch）, Applicable Season:Four Seasons, Craft of Weaving:Knit, Style:Casual, Product Care Instructions:Machine wash, Special Features:Breathable, Special Features:Lightweight, Special Features:Quick Dry, Special Features:Sun Protection, Special Features:Stretchable, Special Features:Sustainable, Special Features:Wrinkle Free, Origin:Mainland China, Material:Cotton 100%, Closure Type:Pull On, Hooded:No, Gender:MEN, Pattern Type:Print, Tops Type:TEES, Item Type:tops, Size: S, Length: 70cm, Bust: 96cm, Waist: 92cm, Shoulder: 46cm Size: M, Length: 71cm, Bust: 104cm, Waist: 100cm, Shoulder: 49cm Size: L, Length: 73cm, Bust: 112cm, Waist: 108cm, Shoulder: 52cm Size: XL,Length: 76cm, Bust: 120cm, Waist: 116cm, Shoulder: 55cm Size: XXL,Length: 80cm, Bust: 128cm, Waist: 124cm, Shoulder: 58cm Size: XXXL,Length: 84cm, Bust: 136cm, Waist: 132cm, Shoulder: 61cm Size: XXXXL,Length: 88cm, Bust: 146cm, Waist: 144cm, Shoulder: 64cm Size: XXXXXL,Length: 92cm, Bust: 154cm, Waist: 150cm, Shoulder: 67cm

Washing Care: Hand or machine washable Condition: new Clothing Decoration: appliques