多空套做
straddle
是投資者（莊家或大的投資機構）的一種交易手法。方法是在多家營業部同時開戶，以拉鋸方式在各營業部報價，從而達到操縱股價的目的。
Investors (the dealer or large institutional investors) a trading practices. Method is to open an account in a number of business department to see-saw manner in all business department offer, so as to achieve the purpose of manipulating stock prices.