赫拉克利特说,世界是一团永恒的活火,在一定的分寸上燃烧,在一定的分寸上熄灭。它没有体现的哲学道理是( )
The book was written in 1946, the education system has witnessed great changes.
My wallet isn’t in my bag. Where I have put it?
Many children may be fond of animals, but ever think of making the study of animals their career.
The country has already sent up three unmanned spacecrafts, the most recent at the end of last March.
.______ the satellite launch drawing near, the research workers put their hearts to the test and always stayed up late.