espy的现在进行时为：espying...

ladder的现在进行时为：laddering...

Sally的现在进行时为：sallying...

buffet的现在进行时为：buffeting...

churn的现在进行时为：churning...

sting的现在进行时为：stinging...

sickle的现在进行时为：sickling...

compile的现在进行时为：compiling...

bus的现在进行时为：bussing...

attitudinize的现在进行时为：attitudinizing...

toddle的现在进行时为：toddling...

excel的现在进行时为：excelling...

beaver的现在进行时为：beavering...

crop的现在进行时为：cropping...

lust的现在进行时为：lusting...

bestow的现在进行时为：bestowing...

assail的现在进行时为：assailing...

rebuild的现在进行时为：rebuilding...

bucket的现在进行时为：bucketing...

harbor的现在进行时为：harboring...

expiate的现在进行时为：expiating...

首次在空中航行的飞行器是气球.The first vehicles to navigate the air were balloons.大型飞行器的驾驶员是航空学方面的专家.Pilots of large aircraft are masters of aviation.他设计了一种新式飞行器.He contrived a new machine for flying....

overdose的现在进行时为：overdosing...

“人行道”的拼音为：rén xíng dào...

“另行”的拼音为：lìng xíng...

“助行架”的英语可以翻译为：[医]walking frames ...

“行家”的反义词：外行。...

“先行”的英语可以翻译为：go ahead of the rest，start off before the others，beforehand，in advance，antecedence ...

“行市”的英语可以翻译为：quotations (on the market)，prices ...

reappear的现在进行时为：reappearing...