+ plus 加号;正号- minus 减号;负号协调英文± plus or minus 正负号× is multiplied by 乘号÷ is divided by 除号= is equal to 等于号≠ is not equal to 不等于号≡ is equivalent to 全等于号≌ is equal to or approximately equal to
Stress: What It Can Do to Us, What We Can Do About ItAnd I'm Bob Doughty. On our program this week, we talk about an emotional or mental influence commonly called stress. We also tell about the effect