1.be to blame 该受责备，应承担责任

The body's weakened immune system and its inability to stave off infections are to blame.

身体免疫系统的衰弱和自身提抗力的无效是患病的主要原因tPY7OngcKDnjee8Sq。

2.put simply 简而言之

Put simply, the prefrontal cortex is at the heart of our most flexible and forward-looking thoughts.

简单地说，前额叶皮层就是我们产生最灵活及最具前瞻性思想的核心|2UGI,~q)u0。

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