см. тж. при помощи

• These problems have been solved using (or employing, or by application of) the Schrodinger equation.

• This is usually accomplished via internal conversion.

• These compounds may be separated by fractional crystallization or through the agency of enzymes.

• Samples are prepared by different methods.

• The levers are operated by (means of) precision cams.

• The low-frequency components are attenuated by the use of a coupling capacitor.

• The temperature coefficients were determined through the use of ...

• This is more easily achieved with (the use of) inorganic phosphors.

• The readings are made with the help (or aid) of a microscope.

см. тж. со временем

• Such experiments will become more precise and more numerous as time passes.

• Since all machines wear, their defects worsen as time goes on (or by).

• Such optical binaries (stars) can be distinguished from real couples only in the course of time.

• In (or With) time some of these bacteria developed metabolic pathways that led to ...

• As time elapses, the concentration profiles take on a different shape.

• Over the years the electronic micrometer instruments have become more and more automatic.

• The magnetic poles of the Earth tend to move slowly with the passage of time.

• These substances have accumulated through time.

• The pole of relative rotation can change its position through time.

• These properties vary with time.