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刚刚收到儿子学校寄来的费用单，如下： General School contribution $190 Special Material Costs $220 Total School contribution $410 Tax deductible library fund $60 Tax deductible building fund $100 technology Maintenance levy $50 P& C donation $115 Grand total $735 这里那些费用是必须交的，那些是自愿交的？谢谢了。 |
