[练习册] TN-08-SC

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On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
  • On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow
  • On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth
  • On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles
  • Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate
  • Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow
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