是 under a big stress 还是 under big stress?

是 under a big stress 还是 under big stress? 是on stress还是under stress? under a lotta stress翻译成什么 under the stress stress under impact冲击应力 shear stress是什么力?最好有图示A fluid is a substance that deforms continuously under an applied shear stress.中的翻译问题.应该是个专有名词,查了词典后说是“剪向力”不知道是怎么样的. Haley had a rest under a big tree.under a big tree 对这些词语提问 she sat down under a big tree对 （under a big tree ）提问 There ---- (be)a pair of shoes under this big tree.这里是看pair吗? under a big tree.去掉a 可以吗?为什么? They sat “under a big tree”.对引号部分提问 Look!A big dog( )(lie)under the tree we sat under a big tree and had our 对under a big tree 提问用什么疑问词 What's under the big book?回答是 There is a boy under the big tree变成一般疑问句,否定句,根据under the big tree提问 Thay sat down under a big treeunder a big tree 对这句话提问 People under stress tend ________ their full range of potential.A.to expressB.to expressingC.expressingD.express