This paper employed shallow water equations with moving pressure to calculate water waves generated by a square-stem ship in shallow water.
本文从含移动压力的浅水波方程出发，计算方尾船在浅水中的兴波。
The stinging nettle has a square stem and little hairs.
荨麻长有四方茎和细小茸毛。
The encoder (from Alps - the tiniest I have ever seen) sits in the slot milled in the PCB, and connects to the stem via a hexagonal channel sized to fit its square end, milled by hand.
编码器(来自Alps -我见过的最小的)放在PCB的槽中，通过六角管道连在表柄上。
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