Though often controversial, PayPal undoubtedly pioneered the process of transferring money online.
虽然往往引起争议，PayPal无疑是开创了在线处理金钱交易的先河。
That's not why the statement is controversial though.
但这并不是这则声明备受争议的原因。
Observations suggest that it is, though they are controversial.
尽管观测结果存在争议，但仍然支持这一推断。
Though most of these propositions may seem elementary or harmless, all are controversial.
虽然大部分的这些主张似乎小学或无害，所有的争议性。
Cancer control efforts might also need to include chemoprevention, though currently available agents are controversial.
虽然现有化学制剂颇受争议，但癌症控制可能还是需要化学预防。
Cancer control efforts might also need to include chemoprevention, though currently available agents are controversial.
虽然现有化学制剂颇受争议，但癌症控制可能还是需要化学预防。
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