在系统地引入做市商制度条件成熟之后，再扩大做市商的做市范围，实行类似于NASDAQ市场的混合交易制度。

While the introduction of market maker system conditions are ripe, further expand the scope of the market makers do, adopt similar to the NASDAQ market in a hybrid trading system.

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该机制最初计划只实行五年，但后来又一再地被延长。

This mechanism was originally planned to function only for five years, but later was extended repeatedly.

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