Yet till now we haven't had systematic research results in this field.
而在这一领域里比较具有系统性的研究成果还没有出现。
Hypertensive disorder complicating pregnancy is a complication specifically occurred in pregnancy. Its etiology has not been determined yet till now.
妊娠期高血压疾病是妊娠期特有的疾病，病因至今未明确。
You have been so courageous till now; I have never heard you cry yet.
你到如今还是这样勇敢；我从没听你哭过。
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