English Dictionary

mainstem

名詞

The principal watercourse of a river that has multiple streams

日本語の意味

本流：複数の支流がある川において、主要で主要な水路・流れとなる部分

The conservationists focused their efforts on restoring the mainstem after decades of pollution from upstream tributaries.

保全活動家たちは、上流の支流からの数十年にわたる汚染の後、その川の本流の修復に力を注いだ。

意味（1）

The principal watercourse of a river that has multiple streams

Piramutaba (Brachyplatystoma vaillantii) make up a second large export fishery and are found almost exclusively in the Amazon River mainstem, whitewater tributaries, and the estuary [30 –32 ].

mainstems （ plural ）