单词：principal beam
principal beam的用法和样例：
例句
- It's possible that the beam may break if the loads outweigh its supports.如果负荷过重，主梁的断裂是有可能发生的。
- It is provided with a telescopic bracket.The box beam at the external side of the telescopic part of the bracket is inserted into the square hole in the main beam.其中，拖架具有可伸缩功能，是通过可伸缩部分外侧的箱形梁插入货台主梁的方孔中，选择箱形梁上孔的位置来实现的。
单词：principal beam 相关文章
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beam, [bi:m] n 大梁（建筑中用作支撑的木材、金属或石头）；光柱；臀围；平衡木 【船】横梁; 船幅; 船舷 (秤)杆; (犁)柄; (锄)把; 卷轴; 横杆; 杠杆 (鹿角的)主干 (灯光、日光、月光等的)束, 道,
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