They have saved people not only thousands of hours but also considerable energy that can be expended on leisure and more personally rewarding activities.
孩子正在發育成長，不能不顧他們的營養；但要為他們準備營養、美觀、可口、適合蒸熱的便當菜卻並不容易。晚餐是一家人得以團聚用餐的時間，一般小家庭都相當重視，但要做出二、三個菜，外加一個湯，飯後再來點水果，也得不少材料才成。