持续几十年的挑战之一是难于找到多型腔模具来生产一模一样的部件。

One that has persisted for years is the difficulty of getting multicavity tools to produce identical parts.

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持续几十年的挑战之一是难于找到多型腔模具来生产一模一样的部件。

One that has persisted for years (decades, actually) is the difficulty of getting multicavity tools to produce identical parts.

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在古埃及，达官贵人的木乃伊，皮肤上多要上色，颈腔要填圆，眼窝里还要装上人造眼球。

In Ancient Egypt the mummy of a nobleman would probably have its skin colored, its neck filled out and man? Made eyes fixed in the eye sockets.

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