新GRE词汇：immaterial

　　supplant: to take the place of

　　1) to take the place of, especially by force, through treachery, or through superiority

　　2) to take the place of; supersede

　　1. The rebels overthrew the government, only to supplant one tyranny with another.

　　2. Can you supplant my position if I cannot play?

　　3. The ancestry of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centuries the spinet, the dulcimer, and the virginal. In the seventeenth century the organ, the clavichord, and the harpsichord became the chief instruments of the keyboard group, a supremacy they maintained until the piano supplanted them at the end of the eighteenth century.

　　4. People who expect underground mass transit systems to gradually supplant out reliance on the automobile are not being realistic.

　　相近词汇：overthrow, succeed, supersede, undermine, uproot, displace, usurp