How to determine EUR (or USD) price from Poloniex Ticker?
BTC_ETH is the exchange information between Bitcoin and Ethereum. In your example, 1 Ether buys about 8% of a Bitcoin.

The volume is given in both BTC and ETH terms.
baseVolume says 2206 BTC have been traded against ETH (last 24h I think)
quoteVolume says 28000 ETH have been traded against BTC

If you want a price in USD you can check the BTC_TUSD ticker, as the Tether-USD price is similar to the real USD price.