18.The goal of executing a perfect layback is more conducive to flow than wanting to burn off your partner or impress a spectator.
完成一完美的layback比企图吓死确保者或吸引观众来得有意义。
19.Underground coal gasification is implemented under changefully natural environment which is difficult and complicated to execute,so scientific safety preventive measures should be adopted.
煤炭地下气化是在多变的自然环境中进行的,操作复杂,难度较大,因此,必须采取科学的安全措施。
20.The protective breaking resistance design of the project shall be executed for predesign or trial design, which is not only opening up, but also practical.