Plants disease resistance controlled by the resistance gene (r gene) is a resistance with high specificity at the cultivar to race level.

植物中抗病基因所决定的抗病性是一种高水平的品种对病原菌小种的专化抗性。

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So crop breeders must race to develop varieties with the right R genes before new disease strains render existing varieties useless.

因而农作物培育者需要赶在新型疾病使现有品种失去价值之前，开发具有正确的R基因的品种。

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The first warning sign for the GOP came in early February in Pennsylvania, in the race to succeed Rep. John Saylor (R), who had died the previous October.

NPR: GOP Nervous About Trends in Special House Races

R, a syndicalist party which did fairly well in the presidential race in 1993, but is now weaker.

ECONOMIST: Venezuela

At the American Le Mans Series' six-hour endurance race at Mazda Raceway Laguna Seca in September, the GT3 R Hybrid walked away from the field, posting the fastest laps in the GT class and stopping only three times for fuel, compared with other competitors' five or more stops.

WSJ: Porsche GT3 R Hybrid; 2012 Porsche 911 S: Porsche Blasts Hybrids Into a New Stratosphere | Rumble Seat by Dan Neil