斜面

1. Origins, structure, and basic meaning

• Structure: 斜面 (しゃめん) is a noun for a mountainside or ground surface inclined away from horizontal.
• Basic usage: 急な斜面を下る makes a steep slope the traversed route, while 斜面に畑が広がる marks a sunny incline as the location of fields.

2. Common pitfalls and similar expressions

• Traversed route and land location
  • In 斜面を下る, を marks the surface traversed, while 斜面に marks where fields lie. Slope angle and direction of movement are distinct information.