very lucky;very fortunate;fortunately;by sheer luck ;

The two cars finished up in a run-off area, clear of the circuit, and that was a mercy.
两辆车最后都停在了缓冲区,避开了赛车道,真是万幸。
来源:《柯林斯高阶英汉双解学习词典》With such a weak heart she was lucky to come through ( the operation ).
她心脏很弱, ( 手术后 ) 能活下来就是万幸.
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