Then a man climbs the module and unfastens the cables of the crane.

工人爬上模块卸掉起重机的吊钩。

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The crane disposes of a 40 meter (132 ft) main boom, a newly developed two-man cab and a novel counterweight system that may be supplemented on site.

本起重机配40米（132英尺）主臂，新开发的双人司机室和一个新颖的可在现场安装的配重系统。

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An SMU officer then saw a man who had climbed into a crane on a construction site at the school "and was yelling down at the officers, " Lawrence said.

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At one point, the man used the radio in the cab of the crane to talk with police, but "none of the communications we had with him were very productive, " he said.

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Dallas (CNN) -- Officials said Tuesday that "spotty" communications over 15 hours preceded a 44-year-old man's fatal fall from a 15-story crane at Southern Methodist University, but offered no explanation for what may have motivated him.

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