翻译下列句子,尤其注意划线词语的译法。 He saw a man sawing trees with a saw . Eat what you can and can what you canno t. The light in the classroom is poor . All dogs have good noses , but the noses of hunting dogs are best. He is a rolling stone. I don’t think he can go far . Every life has its roses and thorns . We have gone through the dog days .