underneath
单词辨析：
指某物在另一物的下面或底下，两者之间有无一定距离均可。
Two old men are playing chess under the tree.
两个老人正在树下下棋。
Your bag is under the bed.
你的包在床下面。
You'd better lie under a blanket.
你最好盖条毯子躺着。
指某物所处的位置低于另一物。
Some cities are below sea level.
有些城市位于海平面以下。
Have you heard voices in the courtyard below your window?
你听到窗户下面的院子里有人在说话吗？
指所处位置时，与 under, below 基本同义，但有时强调在某物的正下方，而且较富有文学性。
Many tourists enjoy feeling the warm sand beneath their feet.
很多游客喜欢脚下踩着温暖沙子的感觉。
Beneath the silvery moon, the sea is more attractive.
在银色的月光下，大海更加吸引人。
They slept outside beneath the stars.
他们露宿在繁星之下。
与 under 的意思相近，但含有将某物隐藏或遮盖起来之意。
I'll leave the key underneath the mat.
我会把钥匙放在垫子下面。
He used to hide his blonde hair underneath a baseball cap.
他以前常用一顶棒球帽裹住满头金发。
Even she herself has forgotten about the box underneath the floorboards.
甚至她自己也忘了藏在地板下面的盒子。
相关例句：
The device exploded underneath a van.
该装置在一辆货车底下发生了爆炸。
I have so many friends, but deep down, underneath, I have a fear of loneliness.
我虽然有很多朋友，但心底里还是惧怕寂寞。
He was as violent as Nick underneath
在内心深处，他和尼克一样暴躁不安。
His bare feet were smooth on top and rough-skinned underneath.
他赤裸的双脚脚面很光滑，脚底却很粗糙。
The sand martin is a brown bird with white underneath
崖沙燕是一种褐羽白腹的鸟。
Check the actual construction of the chair by looking underneath
看看椅子的下面，检查一下它的实际构造。