If the idea is based on a verb, the second reference might be replaced with an expression like “do so”, “do the same”, “do likewise” or “do this”:

Example: Original: It took three years for rural reform to show results, and it will take longer, three to five years, for urban reform to show results.

Revision: It took three years for rural reform to show results, and it will take longer, three to five years, for urban reform to do so.

Original: We must strength our leadership and quickly correct our deficiencies as a means of mobilizing and developing the potential of our intellectuals. To mobilize and develop the potential of our intellectuals, we must first of all …

If, as is more usual, the idea is based on a noun accompanied by modifiers, there are a number of means of abbreviating repeated references. Here we shall deal only with the three principal ones, plus a fourth that is available in special cases:

1. eliminating the modifiers

2. replacing the expression with a summary noun

3. replacing the expression with a pronoun