в зависимости от обстоятельств

• Those substances are able to rotate the plane of polarized light to the left or to the right, as the case may be.

• Definitions may be altered as dictated by the convenience of the situation.

• The molten metal is charged into alloying furnaces, or cast into pigs, as (may be) required.

• The temperature of the solution is controlled by introducing hot or cold solution, as the situation requires.