Anh
axis of the trough
axis of trough
trough line
Đức
Trogachse
Troglinie
Pháp
ligne de creux
thalweg
Trogachse,Troglinie /SCIENCE/
[DE] Trogachse; Troglinie
[EN] axis of the trough; axis of trough; trough line
[FR] ligne de creux; thalweg