1. Such an inevitable conflict, together with the impracticability of Philosophical Education, is vividly illustrated in Plato's Cave-Metaphor.

2. In this paper, in order to remedy the impracticability of classical guidance algorithm in engineering, we have presented an autonomous guidance strategy based on optimal states feedback technology.

3. Due to the characteristic of technical impracticability, it is hard to calculate the cost of remedying contaminated soil and groundwater.

4. The word practicable means that the employer must prove the impracticability of precautions.

5. But the prohibition policy of wine did not satisfy the rulers'wishes, the vast distance between the sublimate decision and real operation declarated the impracticability of the policy.

6. The invalid contract in China bears the legal characteristics of illegality, impracticability , original invalidity and deserved invalidity.

7. The main management item of the company is unmanned and responsible, purchase, the plan such as sales promotion all approves impracticability because of unmanned autograph.

8. The weakness of Chinese current research situation is shown on its impracticability in execution , and serious problems in the theory system itself .