挑重担，首当其冲
1. 首当其冲：stand in one's own light 背光 | stand in the breach 首当其冲 | stand in the gap 挺身阻挡
2. 承受最厉害的攻击, 首当其冲：step into the breach充当临时代理人 | stand in the breach承受最厉害的攻击, 首当其冲 | throw oneself into the breach承受最厉害的攻击, 首当其冲