A headache is a pain in the head which almost everyone feels at one time or another. Almost half of all people have a headache at least once a year. Most headaches are not dangerous but they get in the way of your work and disturbyour life. Although many people see a doctor when they have a headache,physicians normally cannot see […]
Stem cells are basic cells that can change into any other type of cell that our body needs. Most cells in the body begin as stem cells. Then, they grow into tissue of other body parts. Cells in adults have a certain function. Most of these cells, for example, heart orliver cells cannot be changed. Scientists think that they can cure certain diseases by using stem cells. For […]
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+ Voiceless (âm gió)
+ Voiceless (âm gió)
+ Voiceless (âm gió)
+ Voiced (âm có thanh)
+ Voiced (âm có thanh)
+ Voiced (âm có thanh)
+ Voiced (âm có thanh)