最近，该银行一直试图进入衍生产品市场的内部圈子，但是至今仍被拒绝。
Recently, the bank has been seeking to enter the inner circle of the derivatives market, but so far, it has been rebuffed.
真空集热管从规模化生产至今已有近20年时间，产品结构、工艺、设备已很成熟，热性能指标的提高已非常难。
The production has been nearly 20 years from the time scale of vacuum tube, product structure, process and equipment has been very mature, the thermal performance of the already very difficult.
至今已有多年的机械产品生产经验。
Until now had many year engineering products production experience.
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