重點講解:
1. at present 目前;現(xiàn)在;眼下;
The grotto is not accessible at present.
該石窟目前不可進入。
2. make up 組成;構(gòu)成;
North Africans ma ke up the largest and poorest immigrant group in the country.
北非人構(gòu)成了該國最大的、也是最貧困的移民群。
3. let one's guard down 喪失警惕;放松警惕;不提防;
You can't let your guard down.
你不能放松警惕。
4. due to 由于;因為;
The train had stopped due to a mechanical problem.
火車因為機械故障停了下來。
n. 承諾,保證; 確定,實行