They require an environment in which to start and operate.
它们需要一个启动和运行的环境。
Quad tones are so complex that they require an entire article to explain.
四音调是如此复杂，它们需要整篇文章来说明。
Please give your seat to an elderly or disabled person if they require it.
如果上了年纪的人或残疾人要求你让座，请把座位让给他们。
But they require patience and commitment for an effective result.
一个有效的结果，但他们需要耐心和承诺。
But they require patience and commitment for an effective result.
一个有效的结果，但他们需要耐心和承诺。
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