例句與造句

1. to avoid a race condition where the last handler can be removed between the null check and the invocation of the event, event sources should also create a copy of the event before performing the null check and raising the event
   若要避免爭用條件（最后一個(gè)處理程序會(huì)在空檢查和事件調(diào)用之間被移除），在執(zhí)行空檢查和引發(fā)事件之前，事件源還應(yīng)創(chuàng)建事件的一個(gè)副本。
2. to avoid a race condition where the last handler can be removed between the null check and the invocation of the event, event sources should also create a copy of the event before performing the null check and raising the event
   若要避免爭用條件（最后一個(gè)處理程序會(huì)在空檢查和事件調(diào)用之間被移除），在執(zhí)行空檢查和引發(fā)事件之前，事件源還應(yīng)創(chuàng)建事件的一個(gè)副本。
3. It's difficult to find null check in a sentence. 用null check造句挺難的