A clearly defined track now leads down to the valley.

眼前有一条清晰可辨的小径通向山谷。

Here the path is less defined.

小路在这里就不那么清楚好认了。

She had a strongly defined chin, a high forehead, and light grey eyes.

她有着轮廓分明的下巴、高高的额头和一双浅灰色的眼睛。