On a_____ ,he can only earn 50 yuan every day by selling vegetables.
问题描述：
On a_____ ,he can only earn 50 yuan every day by selling vegetables.
答
On average_,he can only earn 50 yuan every day by selling vegetables
on average表示一般来说的意思
翻译：一般说来,他每天通过卖蔬菜可以挣50元