Rub the fingertips of one hand into the palm of the other, then reverse.

把一只手的指尖放在另一只手的手掌里搓洗，然后换手再做一遍。

youdao

He smacked a fist into the palm of his hand.

他用拳头啪地猛击一下手掌。

《牛津词典》

He held the bird gently in the palm of his hand.

他把小鸟轻轻地托在掌心。

《牛津词典》

More phones will be able to support Facebook giving even more people access to their online communities from the palm of their hand.

VOA: standard.2010.07.23

Now Susan Mayne, who is a Professor here in the School of Public Health, has done some very interesting work with an electronic device that can be passed over the palm of your hand and measures pigmentation in the hand as a way to assess vegetable intake in people.

苏珊·梅恩,我们公共卫生学院的教授,做了些值得关注的工作,通过电子设备,扫描你的手掌,测算其上色素沉淀,可以得出人们蔬菜的摄入量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Though rendered banal by years of TV ads lamenting "the heartbreak of psoriasis, " the skin disorder actually is a serious immune disease, affecting 7 million people in the U.S. In more than one-third of patients it mars 10% or more of the body surface (the palm of the hand counts as 1%).

FORBES: Skin Deep

The power of a large and heavy size super-telephoto lens is available on the compact body of the SP-720UZ, fitting in the palm of your hand, and making it the perfect companion for keeping baggage light on a trip.

ENGADGET: Olympus introduces Stylus SP-820UZ, SP-720UZ cameras and SZ-14 binocular bundle

The control systems weighs a little more than half a pound, fits in the palm of the hand and operates on a single battery for the better part of a year.

FORBES: Smart Guns Key to Next-Gen Soldier Systems