従来より・・・ものが知られている

Translate: 従来より、内燃機関に用いられるピストンとして、合金から成るものが知られている。

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Conventionally, pistons used in internal combustion engines made of alloys are known.

あなた:

 

Consider the following 1. Conventionally, as the piston used in internal combustion engines, one made of an alloy is known. 2. Conventionally, as the piston used in an internal combustion engine, a piston made of an alloy is known. 3. Conventionally, as a piston used in an internal combustion engine, a piston made of an alloy is known.

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Here’s an evaluation of the proposed options:

1. "Conventionally, as the piston used in internal combustion engines, one made of an alloy is known."

   • Grammatically correct.
   • The use of "the piston" implies a specific or unique piston, which may not align with the general context of pistons used in internal combustion engines.
   • "One made of an alloy" is fine but slightly formal and less fluid than necessary.

2. "Conventionally, as the piston used in an internal combustion engine, a piston made of an alloy is known."

   • Grammatically correct.
   • The singular "an internal combustion engine" works better when referring to a general example rather than the entire class of engines.
   • Repeating "a piston" makes the sentence a bit redundant.

3. "Conventionally, as a piston used in an internal combustion engine, a piston made of an alloy is known."

   • Grammatically correct.
   • The use of "a piston" aligns well with the indefinite and general nature of the statement.
   • Repeating "a piston" might feel redundant, but it ensures clarity.

Preferred Revision:

If aiming for conciseness and clarity:

• "Conventionally, as a piston used in an internal combustion engine, one made of an alloy is known."
  (Avoids repetition of "a piston" and feels natural.)

Alternatively, a simplified version:

• "Conventionally, pistons used in internal combustion engines made of alloys are known."
  (Direct and avoids any potential awkwardness in phrasing.)