1.capture image 捕捉图像
Lenses are used in microscopes and cameras to focus light, thus allowing a researcher to see small things or a photographer to capture image of things that are far away.
显微镜和照相机中的透镜能够聚光，因此研究人员能够看到微小的物体，摄影师能够捕捉远处的影像。

2.for lack of a better word 没有比...更好的词语了
Greed, for lack of a better word, is good.
没有比“贪婪”更好的词语了。