I sometimes find it a strain to be responsible for the mortgage.

我有时发现偿还抵押借款是个负担。

《柯林斯英汉双解大词典》

Yuan spent four years looking for a wild rice strain that could be crossed.

袁先生花了四年时间寻找一种可以杂交的野生水稻品种。

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From other angles it seems to be under a Herculean strain, as if fighting to support the enormous weight of the cantilevered floors above.

从另一个角度看它又像是在施展大力神的应变力，想要努力支撑住上面的巨大的悬臂式底板的重量。

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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

"We had a new strain of flu. We did not really know that its lethality was going to be.

VOA: standard.2009.05.03

Hundreds of millions braved the cold winter weather to travel home to be with their families, putting a great strain on the country's transport system.

VOA: standard.2010.02.14

Teachers here realize such absences can be a strain on the students.

CNN: Fort Bragg families struggle with risks of war

Within hours thousands of news services have been marking the geography of death and illness, pointing to an usually aggressive outbreak of what appears to be a rampant strain of E. coli.

FORBES: The Best and Worst of Times: Killer Vegetables, Plunging Markets, Infinite Nature

Webby has been working to produce a candidate virus against H1N1 as well, but told CNN the virus is growing slower than expected, and that it would likely be a few weeks before a suitable strain is ready to be sent to the CDC.

CNN: Candidate virus for H1N1 vaccine arrives at CDC