Sigma.
[医] 千分之一秒
🗣️ 情景例句
Hi. This si Peter from Dr. Alice's office.
嗨，你好，我是埃里斯诊所的彼得。
Do you think there is something wrong with the contract?
你认为合同有问题吗？
Because the Moon has only an eightieth of the Earth's mass,
因为月球的重量只有地球的1/8，