《生物医学工程专业英语》Unit 2 The Measurement of Pressure.pptxVIP

Unit 2 The measurement of Pressure;New words;New words;1. the pressure due to the atmosphere (Lines 6-7): 大气压，又如：acceleration due to gravity (重力加速度) 2. the height of a column of water and a column of mercury for this situation (Lines 9-10): 此处height表达物理量高度，为不可数形式，当它表示某个高度的位置时，为可数名词，如From a height, it looks like a desert. 或I’m not afraid of heights.;The same principle used in a barometer to measure atmospheric pressure can be applied to measure the pressure at some location in any fluid (Lines 14-16)：用作气压计中测量大气压的同一原理可应用于测量任意流体中相同位置的压强。 词句中use和apply均表示“使用”或“应用”。英语中一般作者会尽可能使用不同的词汇来表达相同或类似的意思，特别是同一句子中或同一段落中，除非是有严格定义的术语，比如能量，只用energy而不用power，因为power对应于另一物理概念即功率。表示“使用”的常用词汇还包括adopt和employ。;4. the sum of atmospheric pressure at the open end of the manometer plus the pressure due to the excess fluid column on the open side of the tube (Lines 22-23): 压力表开口端的大气压加上由于管子另一开口处额外液柱造成的压强。 此处plus的用法相当于and（连接词），本句中the sum of 可以用 the来替代，因为plus可以作介词用。 5. The cuff is inflated with sufficient air to stop blood flow in the brachial artery and, while listening with a stethoscope just below the cuff, air is slowly let out of the cuff (Lines 35-38)：用足量的空气使袖带膨胀，以停止臂动脉的血流，然后缓慢将空气从袖带中释放，同时用袖带下的听诊器聆听。 此处 while listening为listen的现在分词加while用作表时间概念的状语。本句遇到这种结构应期待后面完整的句子结构或谓语动词。;6. The blood flow can be heard through the stethoscope due to the turbulent flow that produces an audible tapping noise, known as the Korotkoff sounds (Lines 40-42): 由于湍流能产生被称为柯氏音的可闻叩击杂音，通过听诊器能听到血液的流动。 此处用到了限制性定语从句的引导词that。注意which和that的区别：非限制性定语从句由which引导，一般可用逗号分开，如果将此从句删除不会影响全句的主要思想。而that引导的限制性定语从句在是表达句子意思所不可或缺的，而且不能用逗号分开，这一点在英文写作中尤其要注意。例如： Mr. Britling ran through a little list of stay-at-homes that began with a Duke. 布利特林先生细细看过一张深居简出者的名单，上面第一个是一位公爵。 Water, which is a clear liquid, has many uses. 水是一种清澈的液体，有许多用途。;7. There are also devices that use a piezoelectric crystal, a crystal which when compressed by small displacements due to pressure produces an electrical response that can be directly measured (Lines 59-62)：还有些仪器