在这儿。雷鸟二号发射井，装卸臂那里。

Here they are. thunderbird 2 silo, in the loading arm.

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臂架型起重机：可在圆形场地及其上空作业，多用于露天装卸及安装等工作。

Jib crane: in circles over the operation site and more for open-air handling and installation work.

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建立了伸缩臂式自装卸机构总体参数优化设计的数学模型。

The mathematical model used for the optimal design of the general parameters of the auto loading device with telescopic handling arm is created.

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