句子主干为to be able to say ... is noteworthy,主语很长(包含宾语从句、表语从句和同位语从句)。具体结构尝试分析如下:
At the base level 【状语】
to be able to say 【主语的主干】
that this is 【say的宾语从句1】
how we think about these risks, 【宾语从句1中的表语从句】
and 【连接say的宾语从句1和2】
this is an acknowledgement 【say的宾语从句2】
that it is something that we want to avoid, 【宾语从句2中的同位语从句】
particularly during a difficult time,【状语】
I think【插入语】
is noteworthy【系表结构】.