delta

delta — noun

1. a wide, low-lying region near the end of a river, where the water spreads out in

1.名詞B1
釋義

a wide, low-lying region near the end of a river, where the water spreads out into many smaller waterways before emptying into the ocean or a lake

例句

The Mekong delta in Vietnam is famous for its floating markets and rice paddies.

proper noun + delta for a specific river-mouth region

After the flood, the river delta expanded several meters further into the sea.

同義詞
  • river mouth

    a more general term for where a river meets the sea; a delta is one type of river mouth

  • alluvial plain

    a broader geographic term referring to the flat land built up by river deposits; a delta is a specific kind of alluvial plain at the coast

反義詞
  • estuary

    a funnel-shaped tidal river mouth, formed by erosion rather than sediment deposition — the opposite geological process

常見錯誤

❌The boat sailed into the delta of the river.
✅The boat sailed into the estuary of the river.
💡A delta is a landform built from sediment deposits; an estuary is the tidal mouth where fresh and salt water mix.

2. the name of the fourth symbol (Δ, δ) in the Greek alphabet, used in writing mode

2.名詞B2
釋義

the name of the fourth symbol (Δ, δ) in the Greek alphabet, used in writing modern and ancient Greek, and as a scientific symbol for change or difference

例句

In physics class, the symbol delta (Δ) represents a change in value.

countable: the symbol delta

Wei practised writing the Greek letter delta during his first language lesson.

collocation: Greek letter delta