· The reasons are twofold.（原因有二）
· This phenomenon can be attributed to...（归因于）
· ... is mainly due to the fact that...（主要原因）
· Several factors contribute to...（多因素导致）
· For instance/example, ...
· Take... as an example.
· A case in point is...（典型例子）
· This can be illustrated by...（可用...说明）
· On the one hand... on the other hand...（一方面...另一方面）
· Although...（虽然...）
· In contrast, ...（相比之下）
· However/Nevertheless, ...（然而）
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