Example sentences of "[been] [v-ing] at [art] [adj] rate " in BNC.
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| 1 | Coupled with this , however , we have to remember the huge concentration of such sediment in deltas such as that of the Mississippi , where it has been accumulating at a fantastic rate ( perhaps 10 000 feet in the same period of time ) . |
| 2 | The method of carbon dating is based on the assumption that these two reactions have been occurring at a constant rate for the past 15000 years . |
| 3 | Indeed if both the missile and its antidote have been improving at the same rate , we can expect that the latest , most advanced and sophisticated versions , and the earliest , most primitive and simplest versions will be exactly as successful as each other , against their contemporary counter-devices . |
| 4 | In these circumstances , it is not surprising to find that population loss from inner areas has been running at a lower rate in the 1980s and that the government 's efforts at introducing more private investment have met with some measure of success . |
| 5 | Levels of intermarriage , in the first place , varied considerably from republic to republic and from nationality to nationality ; and although the proportion of ethnically mixed families at the national and republican level might have been increasing , it did not necessarily follow that the incidence of intermarriage between each of the major nationalities had been increasing at a similar rate . |