RT在玩高频，可是总是对trade data 和quote data搞混淆了。
1）它们有啥区别？
2）翻译成中文是不是就是分笔和分时数据？
3）还有几个抽样的
(i) calendar time sampling (CTS) using transaction prices,
(ii) calendar time sampling (CTS) using mid-quotes,
(iii) transaction time sampling (TRTS) using transaction prices,
(iv) tick change time sampling (TTS) using mid-quotes.