减脂餐主要包括蛋白质、蔬菜以及碳水,可制作美味的鸡胸玉米沙拉,将鸡胸肉切开,在锅中烧开水,加入卤料,鸡胸肉,小火慢炖30分钟,煮熟的玉米剥下来,胡萝卜、黄瓜切成丁状,将煮好的鸡胸肉放入盘中加入番茄酱便能
I have an html form where the width of a textarea is specified with cols=. I want the textarea to have a specific width in terms of number of characters.