In the primary stage of their civilization, they had no metal tools.
在他们的文明最初阶段,他们没有金属工具。
If you leave your metal tools outside in the rain, they will rust.
如果你在雨天把金属工具放在外面,它们会生锈的。
In the primary stages of their civilization, they had no metal tools.
在他们文明的最初阶段没有金属工具。
Metal tools record a superior civilization.
金属工具的使用标志着高度的文明。
Metal tools record a superior civilization.
金属工具的使用标志着高度的文明。
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