这些障碍物对于逆流而上的鱼来说是致命的。

The barriers are lethal to fish trying to swim upstream.

《柯林斯英汉双解大词典》

由原始的本能所驱动，大马哈鱼会奋力逆流而上在它们出生的同一个安静的水池内产卵。

Driven by primordial instinct, the salmon hurl themselves upstream to spawn in the same tranquil pools where they themselves were born.

youdao

由原始的本能所驱动，大马哈鱼会奋力逆流而上在它们出生的同一个安静的水池内产卵。

Driven by primordial instinct, the salmon hurl themselves upstream to spawn in the same tranquil pools where they themselves were born.

youdao