n.(习惯于早或晚)起床的人，立板(楼梯踏步板的竖直部分)

原形：riser复数：risers

The riser was securely fastened to the wall to ensure stability.
为了确保稳定性，立管被牢牢地固定在墙上。
In deep-sea drilling, the riser system is critical for transporting fluids and tools between the rig and the seabed.
在深海钻探中，立管系统对于在钻井平台和海底之间运输流体和工具至关重要。
The company has developed a new type of riser that can withstand extreme pressures at great depths.
这家公司已经开发出一种新型立管，能够在极大深度下承受极端压力。
The engineer checked the integrity of the riser before proceeding with the operation.
工程师在继续操作前检查了立管的完整性。
The riser pipe in the building's plumbing system was found to be corroded and needed replacement.
建筑物给水系统的立管被发现已腐蚀，需要更换。
During the construction phase, the installation of the riser was a critical path activity.
在施工阶段，立管的安装是一项关键路径活动。
The riser design must take into account the potential for thermal expansion and contraction.
立管设计必须考虑到热胀冷缩的可能性。
The fire department ensured that all the fire risers in the building were functional and accessible.
消防部门确保建筑内所有的消防立管都处于可用状态并且易于接近。
The riser block on the circuit board distributes power and signals to various components.
电路板上的立管块将电力和信号分配到各个组件。
The artist used a riser to elevate her canvas so she could work comfortably standing up.
艺术家用一个立管抬高她的画布，这样她站着工作时会更舒适。