Early settlers built frames of spruce, maple and pine.早期的定居者用云杉木、枫木和松木建造屋架。It was made of soft lumber, spruce by the look of it.其制作材料是软木，看起来像是云杉。He looked spruce in his best clothes.他穿了最漂亮的衣裳,看来很神气....
在门下面插个楔,好让门开着.Put a wedge under the door so that it will stay open.楔体破坏的分析将在第8章中讨论.The analysis of wedge failures is discussed in Chapter 8.这些额外的木楔是以防万一的.These were extra wedges in case they should be needed....
A supernova sprays space with many different elements.超新星会向宇宙放射不同种类的元素。At least one supernova occurs per decade in our galaxy.在我们的星系中每 10 年至少有一颗超新星出现。The ejected mass then probably becomes the observed material of a supe...
她把包装盒子的玻璃纸撕了下来。She tore the cellophane wrapping off the box.玻璃纸系由长形纤维分子组成.Cellophane is made of long, fibrous molecules.插入红色或蓝色的玻璃纸,观察条纹宽度的变化.Interpose red or blue cellophane and observe the change in the width of the fr...