We call it work strain — high workload and low control.

我们称它是工作紧绷——高工作量和低控制。

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Each year,scientists work to develop a unique influenza vaccine to protect people against the strain expected in the coming flu season.

VOA: standard.2010.07.21

To make matters worse, it may turn out that no vaccine will work on every strain of the AIDS virus.

FORBES: Latest Hope For An AIDS Vaccine

In the Middle Ages, European craftsmen refined the design, improving the efficiency and allowing pack animals to do more work with less strain.

FORBES

In Europe many funds found that the assets they pledged as collateral in return for financing from Lehman have become trapped in the bankruptcy process as administrators strain to work out which assets genuinely belong to clients.

ECONOMIST: Where will hedge funds put their business in future?