求翻译：白鳍豚主要生活在长江中下游及与其连通的洞庭湖、鄱阳湖、钱塘江等水域中，通常成对或10余头在一起，喜在水深流急处活动。现有数量稀少，20年前的估计只有300头左右，当时就已面临灭绝的危险。是什么意思？

Living mainly in the Yangtze River baiji and its connected Dongting Lake, Poyang Lake, the Qiantang River and other waters, usually in pairs or more than 10 heads together, like at a depth of flow at the emergency activities. Existing number of rare, estimated that only 20 years ago, about 300, at t

White Dolphin live mainly in the middle and lower reaches of the Yangtze and its connectivity of Dongting and Poyang Lake, Qiantang River waters, such as 10, and usually more than 50% of the head or the Accident and Emergency Department in deep water activities. Existing paucity of 20 years ago, it

If the lipotes vexillifer main life middle and lower reaches Yangtze River and waters and so on in Dongting Lake, Poyang Lake, Qiantang River which connect, the usual pair or 10 remainders in the same place, happy flow the anxious place activity in the water depth.The existing quantity is scarce, 20

Lipotes veallifer live mainly in the middle and lower reaches of the Yangtze River and Dongting Lake with connected thereto, in the Poyang Lake, Qiantang River waters, usually in pairs, or more than 10 minutes in, the water is deep and the current fast activities. The existing number of rare, 20 yea

Lipotes veallifer live mainly in the middle and lower reaches of the Yangtze River and Dongting Lake with connected thereto, in the Poyang Lake, Qiantang River waters, usually in pairs, or more than 10 minutes in, the water is deep and the current fast activities. The existing number of rare, 20 yea