Keep in mind that an idealized monochromatic plane wave must be depicted as an infinite wave train . 要记住，一个理想的单色平面波应当表述为一个无限的波列。
In the days and years that are to come we shall work for a just and honorable peace, a durable peace . 在未来的岁月里，我们将为一个正义的，光荣而持久的和平而努力。
The incident, related thus briefly, was an exciting story of extraordinary daring and resolution . 此事在叙说上虽甚简单平常，但事实上乃为一个勇敢又果断的紧张故事。
Figuratively, one may imagine the radiation of such a spherical maser as resembling a little hedgehog . 可以很形象地把这种球状脉塞源的辐射想象为一个小刺猬球的样子。
On the other hand, if the oven is heated, it can serve as a source emitting energy through the hole . 另一方面，若炉子被加热，它就能够做为一个辐射源通过小孔发射能量。
The heart is located roughly in the center of the chest cavity. it is surrounded by a protective membrane, the pericardium . 心脏大至位于胸腔的中央，为一个保护膜即心包膜所包围。
The motor case is a steel cylinder closed tight at one end. the other end is the open throat and nozzle . 发动机壳体为一个其一端为密封的钢铸圆柱缸体，另一端则为敞口的喉道及喷管。
However, experimentally one never detects a fraction of an electron; electrons behave as indivisible entities . 然而，实际上，从未探测出一个电子的一部分，电子表现为一个不分的实体。
The formulation of a mathematical model of a structure first requires the idealization of the structure into a mechanical model . 欲建立结构物数学模型，首先要求将结构物理想为一个力学模型。
The wandering winds, even the sun and rain, seemed to conspire in favour of so clever and hard-working a man . 东飘西荡的风，甚至太阳和雨水，似乎都在合谋为一个如此聪明、如此勤奋的男人造福。
