mother-calfCOCA²⁸⁰¹³⁶⁺⁵ 例句 The other was that it has been proved that the mother-calf link in the vulnerable period could be broken down by the man-made ship noise, which becomes the exterior cause of the problem. 二是通过实验证明船舶噪声在此脆弱期极有可能破坏母子联系，这是导致其死亡率高的外在因素。 xiaoxiaotong