delta

• 指河流入海或入湖处因泥沙沉积而形成的三角形地貌，也指希腊字母表的第四个字母。

A noun referring to a landform at the mouth of a river where it splits into multiple channels, formed by sediment deposition, or the fourth letter of the Greek alphabet.

1. River landformB1formal

   A landform at the mouth of a river where it splits into several streams and deposits sediment, often forming a triangular shape.

   三角洲

   • The Nile Delta is one of the most fertile regions in Egypt.
   • The river delta is home to many species of birds.
   • Sediment builds up over time to create a delta.

2. Greek letterB2formal

   The fourth letter of the Greek alphabet (Δ, δ), often used in mathematics and science to denote change or difference.

   德尔塔

   • In physics, delta (Δ) represents a change in a variable.
   • The symbol for the Greek letter delta is used in equations.
   • Delta is often used to denote the difference between two values.

3. Change or differenceB2formal

   A term used in various fields to indicate a change, difference, or increment.

   变化或差异

   • The delta between the two measurements is significant.
   • We need to calculate the delta in temperature over time.
   • The financial report shows a positive delta in revenue.

   同义词changedeviationdifferencedifferentialincrementvariation