Then he went to the West, and worked as a prospector, miner, and speculator, but failed.

然后，他到西部，并担任探矿，采矿，以及投机者，但没有成功。

youdao

He was a sinister and crafty speculator.

他是一个险诈的投机商。

《新英汉大辞典》

The dog had been treated and trained as European, particularly German culture and official practice treat the speculator.

欧洲人，特别是德国文化和官方惯例对待投机者就像对待和训练那只狗一样。

youdao

Aside from the usual risk weather brings to crops, there are four other risks: economic slowdown, the U.S. dollar and speculator involvement, policy risk and capacity constraints.

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