断断续续

I learn Engligh off and on for 4 years.

我断断续续学了四年英语了。

I have been learn english off and on for four years!

我断断续续学了四年英语了。

I learn the English off fwe seasons.

我断断续续学了四年英语了。

Both masker and probe were ramped on and off to avoid spectral splatter.

心理物理测量在依据以下情况实行：（1）频率1000赫兹、反应时间20毫秒的探测音其声音位准高于静音临界15分贝(如15分贝的感觉层次)，（2）将反应时间300毫秒的遮蔽音，其位准调整到可听闻试验中75%的探测音(如探测音仍然在其"遮蔽门槛"内)，遮蔽音和探测音两者断断续续地跳动，以避免频谱散射。3。

Part of the reply reached my ears."Yes," Mr McCallum said,"she's a good girl. I've been meaning to suggest keeping her on..."

我断断续续地听到了一些McCallum先生的答话："是啊，她是个好女孩，我也在考虑着提议留用她…。"

I have learned English for 4 years off and on.

我断断续续学了四年英语了。

I have studied english for 4 years off and on.

我断断续续学了四年英语了。

I have been studying english for 4 years off and on.

我断断续续学了四年英语了。

I have been learning english off and on for four years.

我断断续续学了四年英语了。

I have been learning english on and off for four years .

我断断续续学了四年英语了。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。