Parallel folding can be operated for two times with the buckle plates.Its mode of folding includes parallel fold, concertina fold and letter fold.是什么意思_Parallel folding can be operated for two times with the buckle plates.Its mode of folding includes parallel fold, concertina fold and letter fold.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句