The first transistor was about the size of the palm of a hand, with a depth of two matchbooks stacked on top of each other.
第一个晶体管的大小约为手掌大小，有两个叠起来的火柴盒那么高。
2
He took a step back and touched a palm-sized digital video camera balanced carefully on top of the stereo.
他后退一步，拿起一部原本被小心地放在立体声音响上的巴掌大小的数码摄像机。
3
All the tribe members standing in awe watching a man knocking down coconuts from the top of a 25-metre palm tree, who then descended with no harness or climbing aid.