1. 平原   plain   reef   city, town   bay   Hint Half-n-half Clue   2. 沙漠   reef   plateau   desert   ocean   Half-n-half Clue   3. 城市，镇   bay   mountain   plain   city, town   Half-n-half Clue   4. 国家   oasis   desert   bay   country   Half-n-half Clue   5. 瀑布，秋天   plateau   waterfall, falls   reef   cape   Half-n-half Clue   6. 冰川   glacier   sea   reef   desert   Half-n-half Clue   7. 盐水湖   desert   strait   waterfall, falls   lagoon   Half-n-half Clue