们不能乱扔垃圾的英文是"We cannot litter". 这个表述强调我们不应该随意扔垃圾，应该采取适当的的方法来处理垃圾，以保护环境和保持公共场所的清洁。以下是使用场景：
1. It is important to remember that we cannot litter in public parks.
（要牢记在公园中不能乱扔垃圾是很重要的。）
2. The sign clearly states that we cannot litter on this beach.
（标牌清楚地指明我们不能在这个海滩上乱扔垃圾。）
3. Please dispose of your trash properly; we cannot litter in this area.
（请正确处理垃圾，我们不能在这个区域乱扔垃圾。）
4. The teacher reminded the students that they cannot litter in the school premises.
（老师提醒学生们不能在学校的区域乱扔垃圾。）
5. Littering is strictly prohibited in this national park.
（在这个国家公园里严禁乱扔垃圾。）
6. We must follow the rules and not litter in the designated bins provided.
（我们必须遵守规定，在设定的垃圾桶里扔垃圾，不能乱扔。）
7. Tourists were warned that they cannot litter on the hiking trails.
（游客们被警告在徒步小道上不能乱扔垃圾。）
8. Proper waste disposal is a civic duty, and we cannot litter in public spaces.
（正确的垃圾处理是公民的责任，我们不能在公共场所乱扔垃圾。）
9. The responsible citizens never litter, adhering to the belief that cleanliness starts with us.
（负责任的公民从不随地扔垃圾，始于我们自己的清洁信念。）
10. Children were taught from a young age that they cannot litter and should always use trash cans.
（孩子们从小就被教育不能乱扔垃圾，应该始终使用垃圾桶。）