重點講解：
1. stand down 退下；
I've already instructed my guard to stand down.
我已經叫我的保鏢退下了L988xPk-8@。
2. on board 在火車（或輪船、飛機）上；
They arrived at Gatwick airport on board a plane chartered by the Italian government.
他們乘坐意大利政府的包機到達蓋特威克機場4vH6.OUnu(y|O7p)[o。
3. hand over 交給；遞給；
He also handed over a letter of apology from the Prime Minister.
他還遞交了一封首相寫的道歉信;[!6;eUi0@1[^vx]u。
4. come down 落下；
The aircraft came down in flames, and the heat fused most of the parts together into a solid mass.
飛機冒著火墜落了，大多數部件因高溫而熔成一團LSwz8t5dS-。