要不是系了安全带，她可能就受了重伤。
If it hadn't been for the seatbelt, she could have been seriously injured.
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If英 /ɪf/|美 /ɪf/
it英 /ɪt/|美 /ɪt/
hadn't英 /ˈhædnt/|美 /ˈhædnt/
been英 /biːn/|美 /bɪn/
for英 /fɔː/|美 /fɔr/
解释
"If it hadn't been for" 引出过去的关键保护性因素，主句 "could have been + 过去分词" 表达本可能发生的严重后果。
If it hadn't been for the seatbelt, she could have been seriously injured.
"If it hadn't been for" 引出过去的关键保护性因素，主句 "could have been + 过去分词" 表达本可能发生的严重后果。