立彬の日本語
被験者は無作為に抽出された。
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The subjects for the experiment were chosen at random.
The people for the experiment were chosen at random.
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被験者， 被検者， ひけんしゃ
1. subject (of a medical experiment, etc.), test subject, trial subject, testee
2. examinee (of a full-body scan, etc.)
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無作為， むさくい
1. random, unintentional, unintended
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抽出， ちゅうしゅつ
1. extraction, abstraction
2. selection (from a group), sampling
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される， 為れる
1. to be done (to someone or something)
2. to do, to be doing
(对某人或某物)进行某种动作，する的被动形态；(对某人或某物)正在做，即将做
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
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