train of thoughts

Noun

The flow of different thoughts one experiences when thinking.

Japanese Meaning

一連の考えの流れ / 頭の中で展開される複数の思考の連続 / 思考が連鎖する状態

During the lecture, his train of thoughts kept drifting, making it hard for him to follow the argument.

講義中、彼の思考の流れは次々と脱線し、議論についていくのが難しかった。

Sense（1）

The flow of different thoughts one experiences when thinking.

trains of thoughts

（ plural ）