Expertly he zigzagged his way across the field, avoiding the deeper gullies.他熟练地左一拐右一拐地绕过深沟，穿过了原野。In such areas small tributaries or gullies will not show.在这些地区,小的支流和冲沟显示不出来.Gullies, streaks, ripples and dust devil track...
He carefully surveyed the ridges and knolls once more , and also the ravines and gullies.他又注意地巡视着那些梁和峁, 还有沟和壑.Expertly he zigzagged his way across the field, avoiding the deeper gullies.他熟练地左一拐右一拐地绕过深沟，穿过了原野。In such area...