However, recent studies on harbor seals, a phocid species.../The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation.
定位句：Zoologists had assumed that females of all phocid species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species.
Even though manufacturers and retailers can forecast aggregate demand with some certainty=It has not prevented companies from predicting aggregate demand with some certainty.
定位句：However, new research concerning supplier relationships in various industries demonstrates that the widespread assumption of Western managers and business consultants that Japanese firms manage their suppliers primarily through strategic partnerships is unjustified. 另外拜托对转折词敏感起来ball ball我自己了
(1)+(2) Both 4r+9−s=04r+9−s=0 and 4r−6−s=04r−6−s=0 cannot be true (simultaneously), as 4r−s4r−s can not equal to both -9 and 6, hence 3r+2−s=03r+2−s=0 must be true. Sufficient.
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However, recent studies on harbor seals, a phocid species.../The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation.