... bell and spigot joint 套接, 套筒接合 bell arch 钟状拱 bell beam 料钟平衡杆 ...
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bell arch
贝尔拱
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Four park sites have increased security since last year -- the Washington Monument, the Liberty Bell Pavilion in Philadelphia, Pennsylvania, the Gateway Arch in St.
CNN: Security tight for September 11 anniversary
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