Icrf
国际天球参考架
🗣️ 情景例句
so that we don't have to worry about any structural problems.
我们就可以不用担心任何结构上的问题。
When do you expect to have this ready for sale?
你希望此种商品何时上市出售呢？
It's very smart.Short skirts are in fashion now.
它很时髦。短裙现在很流行。