1.  speculation on foreign exchange
2.  foreign currency speculation

• 1. 炒外汇: speculation in foreign exchange | Foreign currency speculation
• 2. 炒买炒卖外汇: foreign currency dealing

• 1.乍看之下，炒外汇沙尘暴似乎不怎么引人注意。
  At first glance, dust storms do not seem very fascinating.
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