千克是国际重量标准。

The kilogram is the international standard of weight.

youdao

公斤是国际通用的重量标准。

The kilogram is the international standard of weight.

youdao

重量和长度的国际标准原型用90%的铂，10%的铱制成。

The international primary standard for the kilogram is made of 90% platinum, 10% iridium.

youdao

重量和长度的国际标准原型用90%的铂，10%的铱制成。

The international primary standard for the kilogram is made of 90% platinum, 10% iridium.

youdao