逐步: progressively, step by step...
体质: constitution...
阀门: valve (mechanical)...
试用: to try sth out, to be on probation...
就座: to take a seat...
柱子: pillar...
降落: to descend, to land...
卑鄙: base, mean, contemptible, despicable...
腹泻: diarrhea, to have the runs...
孝敬: to show filial respect, to give presents (to one's elders or superiors), to support one's aged parents...