切实可行

• 七(seven)PHONETIC
• 刀(knife; blade)RADICAL

Using a knife to chop seven times cuts everything apart.

• 口(mouth; opening)RADICAL
• 丁(man; adult male)PHONETIC

A mouth uttering words of approval with a sound like "ding" gives you the character meaning "can" or "able."

• 彳(left foot step)RADICAL
• 亍(right foot; right step)ASSOCIATIVE

Left foot then right foot stepping forward is the very action of traveling down a road.