v.投机，投机买卖，推测，猜测
P. to～about the possibility of a deeper slump in the economics推测经济进一步萧条的可能性

---

～against抛售投机活动

---

～for a fall投机卖出(做空头)

---

～for a rise投机买进(做多头)

---

～in stocks

---

shares 做股票投机生意

---

～on抢购，进行投机活动

---

～on a fall做空头投机

---

～on a rise做多头投机

---

～on the rise and fall of prices买空卖空(趁价格涨落投机)