在此发表的两则题解,旨在发问、解惑,以求益智。这类问题有助于教师思索设疑,把教学引向深入,拟陆续刊登以供参考。欢迎大家为“益智解惑”小栏目投稿。 The two questions published here are designed to ask questions and solve problems in order to seek wisdom. Such questions help teachers to think in line with their suspicions, lead the teaching in-depth, and be published one after another for reference. Welcome everyone for the “puzzle” a small column submission.