The answer is that long-dated bond offer the prospect of a bigger capital gain should recession strike.
这句话should recession strike 的意思是？不是应该是in recession strike吗？
The answer is that long-dated bond offers the prospect of a bigger capital gain should recession strike.
【翻译】答案是，假如经济衰退来袭，长期债券或许会带来更大的资本收益。
should recession strike 等于： if recession should strike（假如经济衰退来袭）
▲ 这里的should 是情态动词，用在条件从句中，表示事件以后发生的可能性，意为“将要；假定要；可能要”。该结构的特征是：
（1）should 表示“以后的可能性推断”，不表示虚拟语气。
（2）主句用陈述语气。
（3）去到if 后，should 提到句首，构成倒装语序。
▲《柯林斯词典》对此的讲解是：You use should in conditional clauses when you are talking about things that might happen. 词典的例句是：
If you should be fired, your health and pension benefits will not be automatically cut off.
假如你被解雇，你的医疗和养老保险金不会自动中断。
Should you buy a home from Lovell, the company promises to buy it back at the same price after three years.
假如你从洛弗尔公司买房，该公司承诺3年后以同样的价格再购回。
▲ 再举几个其他例句：
1. If you should feel worse, please call our nurses at the Triage immediately. 假如你感觉身体不佳，请立即打电话给大家的护士。
2. If it should rain tomorrow, I will stay at home.
明天下雨我就呆在家不出去。
3. I don’t think it will happen, but if it should happen what shall we do?我觉得那件事不会发生，但假如真的发生，大家该如何解决?
4. If he should need this instrument, he may use it.假如他万一需要这个仪器，他可以用它。
5. If he should fail to do the work, you may ask John to go there in his place.万一他不可以做那工作，你们就叫约翰代替他。
▲ 以上例句均可以去掉if，把条件句倒装：
1. Should you should worse, please call our nurses at the Triage immediately. 假如你感觉身体不佳，请立即打电话给大家的护士。
2. Should it rain tomorrow, I will stay at home.明天下雨我就呆在家不出去。
3. I don’t think it will happen, but should it happen what shall we do?我觉得那件事不会发生，但假如真的发生，大家该如何解决?
4. Should he need this instrument, he may use it.假如他万一需要这个仪器，他可以用它。
5. Should he fail to do the work, you may ask John to go there in his place.万一他不可以做那工作，你们就叫约翰代替他。
6. Should you be fired, your health and pension benefits will not be automatically cut off.
假如你被解雇，你的医疗和养老保险金不会自动中断。
7. Should you buy a home from Lovell, the company promises to buy it back at the same price after three years.
假如你从洛弗尔公司买房，该公司承诺3年后以同样的价格再购回。