IT WAS NOT a PULL, but more a strain of my hamstring muscle.

我并没有拉伤，更像是跟腱肌肉紧张。

youdao

In the Ukraine, a strain of the flu has infected 1.4 million people.

在乌克兰，一波流感已经感染了140万人。

youdao

Then back in Spain, they trained a strain of Pseudomonas bacteria to preferentially nibble salt blooms.

回到西班牙后，他们便培养了一种可以优先吞食盐层的假单胞菌。

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World Health Organization officials say it could be months before a vaccine is available to treat this latest strain of flu.

VOA: standard.2009.04.28

So even though he's very closely connected to the legacy of avant-garde modernism, he's also connected to a social realist strain, the naturalist strain.

虽然怀特,与前卫现代主义的传承，有千丝万缕的关联，但他仍具有现实主义。

耶鲁公开课 - 1945年后的美国小说课程节选

So, we have a problem here if we're thinking about keeping things at the lowest energy, so there's a lot of ring strain in the system.

现在有个问题,我们考虑要把能量降到最低，所以环上有许多应力。

麻省理工公开课 - 化学原理课程节选

It targets a strain of the HIV virus that is predominant only in Europe and Asia.

FORBES: Magazine Article

However slickly the Islamists repackage themselves, a strain of intolerance runs through them, particularly in religion.

ECONOMIST: A Muslim Brother is better than a Mubarak crony

The cells did not contain a strain of PERVs known to be able to infect human cells.

BBC: NEWS | Health | Pig organs may be safe for humans