建第二層的平臺(tái)和柱子接上一個(gè)視頻的步驟[thread,30876378 tagid=82861 tid=30876378 title=%E4%B8%AD%E5%B0%8F%E6%AF%94%E4%BE%8B%E4%B8%AD%E5%BC%8F%E5%BB%BA%E7%AD%91%E6%95%99%E7%A8%8B%EF%BC%883%EF%BC%89 pos=24345]