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• The use of such materials is under investigation (or study) [or is being investigated (or studied, or examined)].
• The surface of Venus has been probed by radar signals.
Русско-английский научно-технический словарь• The use of such materials is under investigation (or study) [or is being investigated (or studied, or examined)].
• The surface of Venus has been probed by radar signals.
Русско-английский научно-технический словарь