l for a number of reasons/for a great variety of reasons出于多种原因
l several factors contribute to有几个因素导致
l there’s a combination of factors有一系列因素
l The main reason is that…/The main contributing factor is that…主要原因是......
l The most significant reason might be that…最重要的原因可能是......
l That’s due to the fact that…这是因为......
l I guess/figure/suppose…我想…
l I reckon/assume…我估计/假设…
l I bet/believe...我打赌/相信......
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