If you can use a word correctly and effectively, you comprehend it.

你如果能正确和有效地使用一个字，你就了解它了。

《新英汉大辞典》

If you can use a word correctly and effectively you comprehend it.

你如果可以正确有效地使用一个词，你就是了解它了。

youdao

If you can use a word correctly and effectively you comprehend it.

如果你能正确、有效地使用一个词，你就是了解它了。

youdao

Adjustable rate mortgages exploded onto the scene offering us the opportunity to prosper from correctly guessing the future movement of interest rates but requiring us to comprehend the financial gyrations of these loans.

FORBES: Pension Consultant Shenanigans (September 4, 2004 )