Kna

例句：

1. 2.
   在数学中
2. 3.
   在物理学中
3. 1. She pointed to the clock on the wall with her index finger.
   她用食指指着墙上的表。
4. 2. The weight of a kilogram is equal to 1000 grams, which is also known as "1000kn".
   一千克的重量等于一千克，也被称为“1000kn”。
5. 3. In physics, the mass of an object is measured in kilograms, which is equivalent to "1000 kn".
   在物理学中，物体的质量以千克为单位，相当于“1000kn”。