arch crown的用法和樣例:
例句
- Emission joints of arch and vault shall correspond to direction of radius.
拱和拱頂的放射縫,應與半徑方向相吻合。
- A wooden frame built especially to support the sides of an arch until the keystoneis positioned.
支拱板條專門用來在拱頂石放置好以前支撐拱的兩邊木架子。
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