即使矿源比承租人预测的要少，或者矿源是不可开采的形式，这也是不可退还的。
This is nonrefundable, even if the source of the mineral is less prevalent than the lessee predicted it to be or if it is in an unextractable form.
虽然多数不可退还的机票的有效期长达一年，但还是有数以百万张机票最后被浪费掉。
Watch for Waste - Millions of tickets go unused, even though most non-refundable fares are valid for travel for up to a year.
本年度租金包含不可退还的存款，即使是费用，比如多收的清洁费，直到来年租户迁出才能扣出。
Non-refundable deposits are included in current year rent, even if a fee, for example, a non-refundable cleaning fee, won’t be used until the tenant moves out in a future year.
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