a workman is known by his work

a workman is known by his work 谚语A bird is known by his feathers什么意思? a bird is knwon by its note,a man is known by his talk a great man is known by his enemies 什么意思by在这里起什么作用 A bad workman always blames his tools. A bad workman quarrels with his a bad workman always blames his tools A bad workman quarrels with his tools. a bad workman always biames his tools A bird is known by his feathers.什么意思（是一句谚语） A man is known by people he follows on his microblog的中文意思? A bad workman always blames his tools.是什么意思?