求翻译：2011年后半年，中国楼市的成交量出现大幅下降，主要原因是央行存款准备金基准的提高使得银行信贷额度有限，银行挑客户，提高了首付比例和贷款利率，使部分客户被迫拿出更多的首付；其次审批时间延长，影响成交量是什么意思？

Six months in 2011 after the Chinese property market turnover volume dropped significantly, mainly due to the improvement of central bank reserve benchmark makes the limited amount of bank credit, the bank pick customers, increase the proportion of down payment and loan interest rates, some customer

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In 2011 the latter part of a year, the Chinese real estate market turnover appears the large drop, the primary cause is the central bank bank reserve against deposits datum enhancement causes the bank credit specified amount to be limited, the bank selects the customer, enhanced to pay the proportio

2011 half a year after year, a sharp drop in trading volume of China's property market, mainly due to the improvement of Central Bank reserve base limited bank credit, banks picked customers, increased down payment and loan interest rates, some customers were forced to come up with more downpayment;