“野鸭下蚕”实不可取云南杨光永野泽荒滩，野鸭栖息在哪里，就把蛋下到哪里，这是它们的一种本能。今天下在这儿，明天下在那儿，它不可能想到摆布的艺术性，至多只考虑下在哪里较安全。当外界不对它们构成威胁时，它们更有其绝对的自由。面对黑板，有少数教师的板书，也... “Mallard duck silkworm” is not desirable Yunnan Yeung Yeung Ze wild beach, where the ducks inhabit, put the egg down to where this is their instinct. It is impossible to think of the mercy of the mercy here, at least today, where it is safer today. When the outside world does not pose a threat to them, they are more absolutely free. Facing the blackboard, there are a few teachers on the blackboard, but also ...