Many people see their bellybelly/ˈbɛli/L1肚子the front part of your body between your chest and legs get bigger as they get olderolderL1通过长期经验积累而成的技能skilled through long experience. This can happen even when they do not gain much weight. Scientists wanted to know why. They found a new kind of stem cellstem cell/ˈstem ˌsel/L2干细胞a special type of cell that can develop into many different kinds of cells in the body. These cells make new belly fatfat/fæt/L1脂肪a soft substance under the skin of people and animals.
The scientists studied micemiceL1老鼠mice and human cells. They saw that older mice had specialspecial/ˈspɛʃəl/L1特别的different from usual; important cells. These cells made a lot of new fatfat/fæt/L1脂肪a soft substance under the skin of people and animals. The same cells were in middle-aged people. So this process may happen in humanshumansL1地球上所有现存的人类all of the living human inhabitants of the earth too.
This is good news because it can help us find new ways to stop belly fat. The scientists feel happyhappyL1表达清晰且切中要害well expressed and to the point about their discoverydiscovery/dɪˈskʌvəri/L1发现finding something for the first time. They want to learn more and help people stay healthyhealthy/ˈhɛlθi/L1健康的in good condition; not sick.
