...a tracking system which can follow a burglar round a building and zoom in on his face. [VERB PREP. + on]

可对入户窃贼在整栋楼里进行跟踪并将其面部图像放大的追踪系统

He trained his camera on nature, sometimes zooming in to examine single leaves. [VERB PREP.]

他把自己的照相机对准了大自然，时而拉近镜头仔细观察一片片的叶子。