hypothermia/haɪpəθɜrmiə/[hahy-puh-thur-mee]:subnormal body temperature
ex:People must pay attention hypothermia.
stiff /stɪf/[stif]:rigid or firm; difficult or impossible to bend or flex: a stiff collar.
ex:If you do sport regularly,you have stiff muscles.
Synonyms:
1. unbending, unyielding
Main idea:Sudden movements of cold blood in the body can cause shock and a heart attack.
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