if not possible

基本解釋

Accommodate any guest request, if not possible then offer appropriate alternatives.
滿足客人要求，如果不能滿足，提供客人另外的選擇。
"Any potentially deadly disease is a big problem and … we've got to try to make sure that the spread of this disease is eliminated if possible and minimised if not possible, " he said.
他說：“任何可能致命的疾病都是大問題，我們必須嘗試確保把這種疾病的傳播，如果可能的話徹底消滅，不可能的話則將其控制在最低水平?！?/li>
Try to make a separate space for the patient at home; if not possible, ensure the patient to keep away from others at least one meter.
設法在家中爲病人單獨辟出一塊空間。如果這樣做不可行，讓病人與其他人至少保持一米遠的距離。

If that is not possible, then clean off the equipment and your shoes when leaving.
And so it's not, perhaps, crippling if this is the conclusion we reach, but at the same time it's not the only possible conclusion.
因此，如果這就是我們的結論，也沒有太大關系，但同時要知道這不是惟一可能的結論。
耶魯公開課 - 文學理論導論課程節(jié)選
So that means it's not possible, if we've made these stipulations in the first place, to have a case where l equals 1.
這說明我們之前的假設,ｌ等於１不可能的。
麻省理工公開課 - 化學原理課程節(jié)選

So it's not as if it's not possible to do.
WHITEHOUSE: President Obama Makes a Statement on the Sequester