7-10. 比較各種墊料的類型，並考量每種代表的正面與負面意義；包括灰塵、衛生、沙浴及其水分吸收方面的考慮。 Compare the various types of litter and consider the objective positive and negative aspects of each one. Take into consideration: dust, health, dustbath and moisture uptake.
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