End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
期貨入門篇》期望值 | 什麼是期望值?(點我免費下載Excel計算) https://nico-invest.com/2019/01/29/expectation/