单语范例（未经PONS编辑处理）
A chronic negative energy balance can suppress estrogen levels and decrease bone mineral density.
en.wikipedia.org Chronic (long-term) effects of copper exposure can damage the liver and kidneys.
en.wikipedia.org Chronic exposure to humans may cause kidney damage.
en.wikipedia.org That dramatic population increase, and the secret nature of the project, meant chronic shortages of housing and supplies during the war years.
en.wikipedia.org For part of the person concerned, this means permanent unemployment and persistent chronic poverty.
en.wikipedia.org