小弟不才, 把原文翻译一下
Question: With the U-turn rule when making rivers, does that mean no U-turn ever, or just no immediate U-turns because it will complicate the placement of subsequent river tiles?
问题: 关於河流规则的U型, 那是指所有的U型, 还是指相邻的河流方块做成的U型 (因为这会让放置随后的方块变得更复杂)?
Answer: Only immediate U-turns are explicitly forbidden. (Naturally there can also be problems if a straight river tile lies between.)
只有「相邻的河流方块做成的U型」是明确地禁止 (当然, 如果中间放上打直的河流方块所做成的U型也会出现问题 )