strain

The weightlifter had to strain every muscle to lift the heavy barbell.

(Chinese) 举重运动员必须紧绷每一块肌肉才能举起沉重的杠铃。

He had to strain his eyes to read the fine print on the bottom of the contract.

(Chinese) 他必须眯起眼睛费力地看合同底部的小字。

Scientists are developing a new vaccine to target the latest strain of the flu virus.

(Chinese) 科学家正在研发一种针对最新流感病毒株的新型疫苗。

This particular strain of rice is more resistant to droughts and high temperatures.

(Chinese) 这种特定品种的大米更耐旱和耐高温。