Rotation

(noun.) the act of rotating as if on an axis; 'the rotation of the dancer kept time with the music'.

(noun.) a planned recurrent sequence (of crops or personnel etc.); 'crop rotation makes a balanced demand on the fertility of the soil'; 'the manager had only four starting pitchers in his rotation'.

(noun.) a single complete turn (axial or orbital); 'the plane made three rotations before it crashed'; 'the revolution of the earth about the sun takes one year'.

(noun.) (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin.

阿斯特编辑

• The force of the water causes rotation of the turbine and of the shaft which is rigidly fastened to it. 伯莎M.克拉克. 科学通论.
• In the rotation of crops there was a recognised season for wild oats; but they were not to be sown more than once. 伊迪丝·华顿. 纯真年代.
• Proper reversals of the current are accompanied by continuous motion, and since the disk and shaft rotate with the coil, there is continuous rotation. 伯莎M.克拉克. 科学通论.
• The wind strikes the sails, and causes rotation; and the stronger the wind blows, the faster will the wheel rotate. 伯莎M.克拉克. 科学通论.
• A rotation of this kind seems alone a sufficient security against any practices which cannot be avowed. 亚当·斯密. 国富论.
• The same effect would be produced if the disc, during its rotation, were seen by successive electric sparks. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
• By rotation of a coil (armature) within a magnetic field, that is, between the poles of a magnet, current is obtained. 伯莎M.克拉克. 科学通论.
• The machine which exists is accepted in all its essentials: the goo-goo yearns for a somewhat smoother rotation. 沃尔特·李普曼. 政治序论.
• Water issues in a narrow jet similar to that of the ordinary garden hose and strikes with great force against the lower part of the wheel, thereby causing rotation of the wheel. 伯莎M.克拉克. 科学通论.
• Rotation of _W_ induces rotation of _w_, and a small force at _W_ is able to overcome a large force at _w_. 伯莎M.克拉克. 科学通论.
• He was able to make out the mountains in the moon, the satellites of Jupiter in rotation, the spots on the revolving sun; but his telescope afforded only an imperfect view of Saturn. 李贝. 西洋科学史.
• In this, the relief blocks are replaced by engraved copper rolls which rotate continuously and in the course of their rotation automatically receive coloring matter on the engraved portion. 伯莎M.克拉克. 科学通论.
• As a result _M_ moves downward, and thereby induces rotation in the large wheel _L_. 伯莎M.克拉克. 科学通论.
• If, however, the tube is held, during the rotation of the disk, over the inner row of unequally spaced holes, the musical tone disappears, and a series of noises take its place. 伯莎M.克拉克. 科学通论.
• Before it rose it had acquired the greatest motion the earth's rotation could give it. 本杰明·富兰克林. 富兰克林自传.
• The gyroscopes in this, moved by a gasoline engine, revolved in a vacuum at a speed of three thousand rotations a minute. 佚名. 神奇的知识之书.

录入:玛格