Each package must weigh less than twenty kilograms to qualify for standard shipping rates.

每件包裹必須低於二十公斤，才能適用標準運費。

Passengers on this flight may check one bag weighing up to twenty-three kilograms.

本班機旅客可托運一件重量不超過二十三公斤的行李。

Our supplier charges four dollars per kilogram for the premium coffee beans we order.

我們訂購的高級咖啡豆，供應商每公斤收費四美元。