医生解释说患者有21号染色体的单体性。

The doctor explained that the patient has monosomy of chromosome 21.

阿莱克斯飓风公开报道第21号.

Hurricane Alex Public Advisory No. 21.

兰兰是21号.

Lanlan is number 21.

请到21号登机口.

Please depart from Gate 21.

通过21号跑道前报告, 有一台扫雪机在四号交叉道口工作.

Report before cross runway 21, there is a snow - plough working now at the intersection 4.

这种机器人21号游戏机对提高脑力很有帮助。

This game Robot 21 will help activate your brain.

允许进入跑道,反方向滑到21号(起飞位置).

Cleared to enter the runway and backtrack to position 21.

守门员卢卡斯·法比安斯基将接受普姆留下的21号球衣.

Keeper Lukasz Fabianski takes the No 21 shirt from the departing Mart Poom.

这名歌手会在12月21号一结束旅行就回到英国过圣诞。

The singer aims to spend Christmas in Britain once her tour finishes on 21 December.

结论更新于1月19，21号，注意这节代表我的个人观点（月猪：是。

Implications Updated Jan 19. Updated Jan 21. Note this section is just my opinion.