2025汶川地震短句(精选15句)。
1、 But when table, penholder and paper are all moving, how is it possible to write legibly?
2、 Some devices were quite simple.
3、 It was necessary, therefore, to invent instruments that neither slumbered nor slept.
4、 Instruments have been devised and can be so placed that all three elements can be recorded in different graphs.
5、 The second marks the arrival of transverse vibrations which travel more slowly and arrive several minutes after the first.
6、 An earthquake comes like a thief in the night, without warning.
7、 It is because his feet move on, but his head stays still.
8、 The ideal to be aimed at was to devise an instrument that could record with a pen on paper, the movements of the ground or of the table as the quake passed by.
9、 it would be more like that of a bluebottle buzzing round the room;
10、 but while the drum was being shaken, the line that the pen was drawing wriggled from side to side.
11、 Why does a person standing in a bus or train tend to fall when a sudden start is made?
12、 These two have travelled through the earth.
13、 It will be found that the weight moves but slightly or not at all.
14、 If it were gentle, only the more unstable rods fell.
15、 Imagine an earthquake shock shaking the floor, the paper, you and your hand.
16、 When a shock came, it shook the rigid table upon which these stood.
17、 The key to a solution of that problem lay in an everyday observation.
18、 In the midst of all this movement, the weight and the pen would be still.
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