求翻译：从2007年7月至今我一直在贝莱特中央空调有限公司工作，主要从事的是地源热泵及水冷螺杆机组的研发工作，目前的职位是主任工程师。是什么意思？

Since July 2007 I have been Bailette central air-conditioning Co., Ltd., mainly engaged in ground source heat pump and water-cooled screw chillers research and development, the current position is chief engineer.

From July 2007 to date I have been in belight central air-conditioning limited, mainly engaged in the work is a geothermal heat pump and water-cooled screw crew of R&D work, the present position is chief engineer.

正在翻译，请等待...

From July 2007 till now I've been working at the Bailette central air conditioning, mainly engaged in ground source heat pump and water cooled screw unit research and development work, the current position is the Chief Engineer.

I have been working in shellfish's Letts central air conditioner Co., Ltd. all the time from July of 2007 to the present, it is ground source heat pump and research and development of the water-cooling spiral shell's pole aircrew that is mainly engaged in, the present position is a chief engineer.