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một khi + 
once 他去 过 一 次 伦敦 。 +
Tā qùguò yī cì Lúndūn.
He's been to London once. +
Er war einmal in London.
科学家 专心 研究 。 +
Kēxuéjiā zhuānxīn yánjiū.
The scientists concentrated on their experiments. +
Die Wissenschaftler forschen konzentriert.
like: once
once ☊ 
một khi ☊ once ☊ một phen ☊