Free coffee time vector art card. A cup of coffee shared with friends is a steaming experience, time well spent, happiness tasted. Vector illustration of hot coffee cups, coffee beans and thermos. Beautiful vector compositions with coffee mugs, stylized background and typography. 中毒 中毒 香り コーヒー タイム
A simple balls-and-sticks model of a caffeine molecule. Oxygen is red, carbon is blue-grey, nitrogen gree; hydrogens not shown. Drawn in Inkscape. 分子 モデル カフェイン カフェイン分子