Explain the meaning of SI base units and SI derive

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• 英语翻译This unit of mass has not been given a special name.The International System of Units(SI) is an absolute system.The base units are the meter,the kilogram(for mass),and the second.The unit of force is derived using Newton's second law and is called the newton to distinguish it from the kilogram,which,as indicated,is the unit of mass.The units constituting the newton(N) are .(公式）…The weight of an object is the force exerted upon it by gravity.Design
• Explain the meaning of SI base units and SI derive
• Explain the meaning of SI base units and SI derived units用英文回答
• Explain the meaning of SI base units and SI derive
• Explain the meaning of SI base units and SI derived units
• elevator 在美国英语中多还是英国英语中多
• at top speed 是在最高速 还是在高速