1, "Three is like an arrow on the string" implies that when some three conditions or factors are reached, it is like an arrow is already on the string, and action must be taken quickly.
2. "Two, five, three steps in a hurry" describes that time passes quickly, or that people's actions are in a hurry and urgent. "Hurriedly" is a China word, which describes that time passes very quickly and in a hurry.