The Japanese have a rigid code of etiquette, which may seem artificial to foreigners.
日本人有一套严格的礼仪，这在外国人看来可能是矫揉造作的。
Core spun yarn is produced by covering an elastic, rigid or semi-rigid filament with a natural, artificial or synthetic textile fibre.
在弹性、刚性或半刚性纤丝上覆盖一层天然、人工或合成纤维，就可以生产出包芯纱。
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