Don't get frustrated if increasing your stroke rate is difficult.

如果增加划频很困难，不要受挫。

youdao

Decreasing stroke rate by 3-8 strokes per minute to allow for a long, smooth, rolling stroke.

降低划频每分钟3 ~ 8下，这样才能拥有长的，顺畅的，有滚动的划水。

youdao

For each swimmer they also sped up their stroke rate to 10% and 20% above their natural stroke rate.

每个游泳者也被要求在自然划频的10%以及20%以上游泳。

youdao

But the German crew raised the stroke rate and Britain could not respond after Poland took the lead from Slovenia.

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During the swims, the researchers measured the volunteers' oxygen consumption, rectal temperature, swim speed and angle, and stroke rate and length.

BBC: Cold water increases drowning risk

Many researchers, however, point out that the 30-day stroke and death rate in stent patients was significantly higher (4.8%) than that of surgery patients (2.6%).

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