正负 (zhēng) — positive and negative; plus-minus (in mathematics, electricity, etc.)

Definition

Examples

• 正负符号在数学中很重要。
  zhēng Fú hào zài shù xué zhōng hěn zhòng yào.
  The plus-minus sign is very important in mathematics.
• 这个实验需要测量正负电荷。
  Zhè ge shí yàn xū yào cè liáng zhēng diàn hè.
  This experiment needs to measure positive and negative charges.
• 正负两个方向都要考虑。
  zhēng Liǎng gè fāng xiàng dōu yào kǎo lǜ.
  Both positive and negative directions must be considered.