The stinging nettle has a square stem and little hairs.

荨麻长有四方茎和细小茸毛。

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They attempt to carve a circle like the moon, a straight line like a stem of wheat, a square like a brick, and jaggedly like the beard.

他们试图把一个圆像月亮，直线像干小麦，方形砖，和参差不齐的胡须一样。

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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。

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He says the district's problems stem from its being "a square peg" a district that has about 9, 000 public school children and an estimated 20, 000 in private schools, almost all of them Jewish.

WSJ: Barbs of racism, anti-Semitism in NY school clash