循序渐进 (xún xù jiàn jìn): in sequence

Learning Chinese should be done step by step: first master basic vocabulary and simple sentence patterns, then gradually study complex grammar and discourse.

The fitness coach told me that building muscle can't be rushed; you must proceed gradually, increasing the weight a little each week so your body slowly adapts.

Teaching young children to read should be done step by step, starting with simple picture books and gradually moving on to storybooks with more text.

Scientific research often requires a step-by-step approach: first propose a hypothesis, then design experiments to verify it, and finally analyze the data to draw conclusions.

The company's new employee training adopts a step-by-step approach: the first month is for getting familiar with the environment, the second month for learning the business, and only in the third month do they independently complete tasks.