演出一般都是露天的，有时候甚至没有扩音装置，所以我必须学会在各种条件下让声音传到观众耳朵里。
Often they were outdoor shows, sometimes with no PA system at all, so I really had to learn how to project to be heard.
本文介绍一种用于露天煤场存煤量自动计量的激光摄像盘煤装置。
The automatic measuring instrument based on laser photography for estimating coal storage volume in open stockyard is introduced in this paper.
本发明涉及一种全封闭排气式坨存苫封方法及其装置，属于露天堆坨的苫封。
The invention relates to a totally-enclosed exhaust type lump deposit thatch closure method and a device thereof, belonging to the thatch closure of an open-air stacking lump.
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