Predicting voting trends from economic forecasts is a dodgy business.是什么意思？

Predicting voting trends from economic forecasts is a dodgy business.

根据对经济的预测来预言选举的走势不大可靠。

Predicting

v. 预言，预测，预示( predict的现在分词 )；

例句
There is no way at present of predicting which individuals will develop the disease...
目前还没有办法预测谁会得这种病。

voting

n. 选举，投票；

例句
The deadline for absentee voting in was Saturday.
缺席投票的最后期限是星期六。

trends

n. 趋势( trend的名词复数 )，（海岸、河流、道路等的）走向，流行，时尚；v. 伸向( trend的第三人称单数 )，趋向，倾向，使趋向；

例句
Predicting voting trends from economic forecasts is a dodgy business.
根据对经济的预测来预言选举的走势不大可靠。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

economic

adj. 经济的，经济学的，合算的，有经济效益的；

例句
He's already altered several of the proposals in his economic plan to accommodate demands of special interests.
他已经改动了经济计划中的几项提议以迁就特殊利益集团的要求。

forecasts

n. 预测，预报( forecast的名词复数 )；v. 预言，预报( forecast的第三人称单数 )；

例句
Local radio stations serving coastal areas often broadcast forecasts for yachtsmen...
服务沿海地区的地方广播电台经常为驾驶游艇出海的人播报天气预报。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

dodgy

adj. 逃避的，躲闪的，〈俚〉机警的，巧妙的；

例句
Micky is used to handling dodgy deals but this time fears he may have bitten off more than he can chew.
米基本来是善于处理棘手交易的，可是这回他可能会力有不逮。

business

n. 商业，交易，生意，事务，业务，职业，行业；

例句
Many men still have difficulty accepting a woman as a business partner...
许多男性仍然无法接受女性商业伙伴。