She has continued to dress mainly in black during a long period of public mourning.
自公共哀悼后，很长时间里她的着装仍以黑色为主。
Hence, short breaks are helpful during a long study session.
因此，休息片刻对于长时间学习非常有帮助。
During a long period, PID control plays a major role in the control technologies.
经过时间的考验，PID控制仍然在各种控制技术中占据着主导地位。
During a long period, PID control plays a major role in the control technologies.
经过时间的考验，PID控制仍然在各种控制技术中占据着主导地位。
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