In other words, physical obstacles, perhaps unknown to the original surveyor and engineer, will require alterations to be made in order to surmount them.

Any alteration to this certificate renders it invalid, and use of an altered certificate could constitute a criminal offence.

An ardent affection for the human race makes enthusiastic characters eager to produce alteration in laws and governments prematurely.

Law II: The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.

The plan is incapable of alteration.

How long will it take for alterations?

Interstellar, as opposed to interplanetary, travel was quite impossible until the advent of sub-atomic power. Fortunately this source of power was seldom gained until late in a world's development, when mentality was mature enough to wield this most dangerous of all physical instruments without inevitable disaster. Disasters, however, did occur. Several worlds were accidentally blown to pieces. In others civilization was temporarily destroyed. Sooner or later, however, most of the minded worlds tamed this formidable djin, and set it to work upon a titanic scale, not only in industry, but in such great enterprises as the alteration of planetary orbits for the improvement of climate. This dangerous and delicate process was effected by firing a gigantic sub-atomic rocket-apparatus at such times and places that the recoil would gradually accumulate to divert the planet's course in the desired direction.

But as Lady Ashton raised her head gracefully, expecting the strain at which she was to begin the dance, she was so much struck by an unexpected alteration in the ornaments of the apartment that she was surprised into an exclamation, “Who has dared to change the pictures?”

Climate change impacts on biodiversity are already being observed in alteration of the timing of critical biological events such as spring bud burst, and substantial range shifts of many species. In the longer term, there is an increased risk of species extinction.

Can you make some alterations to this product?