Selenga
色楞格省(蒙古东部省)；色楞格河(中亚河流, 发源于蒙古)
🗣️ 情景例句
You've been a very helpful.
你帮了大忙。
When is the most convenient time for us to meet?
我们什么时候见面最方便呢？
it is extremely difficult to estimate the true value of the services which people perform for us.
但要估算别人为我们为所提供的服务的价值却是极其困难的。