例句與造句

1. shells and skeletons of marine organisms to determine the climate millions of years ago ( see oxygen isotope ratio cycle ).
2. The classification was devised before the development of more accurate dating methods, such as C-14 dating and oxygen isotope ratio cycles.
3. The ultimate standard to which all these dates are to be compared is the graph of the oxygen isotope ratio cycles, which gives change in isotope concentration on the y-axis versus time on the x-axis.
4. The glaciation was favored by an interval when the Earth's orbit favored cool summers but oxygen isotope ratio cycle marker changes were too large to be explained by Antarctic ice-sheet growth alone indicating an ice age of some size.
5. It's difficult to find oxygen isotope ratio cycle in a sentence. 用oxygen isotope ratio cycle造句挺難的