u-invariant of a field

Quentin is a prominent film director as well as the master of "violence aesthetics" in the U.S. film field for his unique and distinctive style.

昆汀是美国影坛上不可忽视的杰出电影导演以及暴力美学表现大师，他的电影作品风格独树一帜，暴力美学色彩鲜明。

Ursula K. Le Guin is a very important writer of the New Wave in the U.S.A., and is one of a few science fiction writers who has been recognized by the mainstream of the literature field.

厄休拉·勒奎恩（也译作娥苏拉·勒瑰恩）（Ursula K.Le Guin）是美国新浪潮的代表作家，也是少数几个被美国主流文学界认可的科幻作家之一。

To determine extent of the effect of groundwater advection on U-type vertical underground heat exchangers, based on a mathematics model considering thermal conduction and groundwater advection, utilizes an overall solution to obtain the whole temperature field including fluid in pipe, pipe wall and surrounding soil.

为确定地下水渗流对U型地下埋管换热器的影响，基于热渗耦合作用下的数学模型，采用整体求解方法求得管内流体、地下埋管换热器及周围土壤的温度场数值解。