- 燒燃料
- be difficult of: 難于, 不易
- be difficult to: 很難去……
- difficult: adj. 1.困難的,(工作等)艱難的。 2.執(zhí)拗的,頑固的。 a difficult disposition 執(zhí)拗的性情。 difficult of access 難接近。 difficult to answer 難答。
- it’s not difficult: 不難
- that’s difficult: 那很困難
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