One can no longer walk the streets without seeing beggars importuning passersby.

走在这些街道上总能看到乞丐纠缠行人乞讨。

It's not safe to walk the streets at night.

夜间在街上走不安全。

By day a woman could safely walk the streets.

白天，妇女可以安全地在街上走。

Is it safe to walk the streets alone at night?

夜间独自一人在大街上行走安全吗？

Is it safe to walk the streets after dark?

天黑以后在街上行走安全吗？