雌海豚每两至三年生一个孩子。她是在水下产婴的。
A female dolphin has a baby every two to three years. She gives birth to the baby under water.
有趣的是，由于他们的人口不多，他们允许在生一个孩子后的第三年生第二个孩子。
Interestingly because their population is low, they are allowed to have second child 3 years after of the birth of first child.
通过三年生产实际的考验，证明仪器性能稳定、使用方便、构造合理、轻便且易于推广。
Through three years'aperation, the device perfects its performance in its stability, portability and efficiency with sound structure for the evenness tests.
应用推荐