Today's trading strategy recommends maintaining a buy-on-pullback strategy. In the short term, watch for a pullback to the 4230-4220 short-term support zone. If it stabilizes, consider arranging a buy opportunity. If it breaks down strongly, wait for a long position at the 4205-4190 low. On the upside, focus on the 4275-4285 resistance zone. On the downside, focus on the 4230-4220 short-term support zone, with a strong focus on the 4205-4190 strong support zone.