Staff members help a doctor to carry out a B-scan ultrasound examination for a pregnant sea lion at Harbin Polarland in Harbin, capital of northeast China's Heilongjiang Province, Aug. 2, 2016. Harbin Polarland invited a doctor of ultrasound department of the No. 2 Hospital Affiliated to Harbin Medical University to examine the sea lion, which is expected to deliver a baby at the end of August. (Xinhua/Wang Song)
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